Every product has an identity.

A bottle of shampoo, a packet of rice, a mobile phone, a cosmetic product, a piece of clothing or a packaged food item may look completely different, but modern commerce needs one common thing:

A reliable way to identify each product.

That is where a Product Identifier comes in.

A product identifier is a unique or structured reference used to distinguish one product or product variant from another.

It helps businesses, retailers, marketplaces, warehouses and digital systems answer a simple question:

“Which exact product are we talking about?”

🧩 What Is a Product Identifier?

🔢 A digital identity for a product

A Product Identifier is a number, code or other structured identifier assigned to a product so that it can be distinguished from other products.

For example, a business may have:

• 🧴 Shampoo 100 ml
• 🧴 Shampoo 200 ml
• 🧴 Shampoo 500 ml

Although they belong to the same product family, they may need different identifiers because they are different product variants.

🏷️ Simple Example

Imagine a company sells three products:

Product A: Herbal Shampoo 100 ml
Product B: Herbal Shampoo 200 ml
Product C: Herbal Conditioner 100 ml

A product identification system can give each product its own identity:

This makes it easier for computer systems to distinguish them.

🌐 Why Do Products Need an Identity?

🔍 Because names are not enough

Product names are useful for people, but they are not always reliable identifiers.

Different businesses may use similar names.

A product may also have:

• Different sizes
• Different colours
• Different flavours
• Different packaging
• Different formulations
• Different versions

A structured identifier helps systems distinguish these products.

📦 Product Identity = Product + Identifier

A simple way to understand the concept is:

Product

⬇️

Unique/Structured Identifier

⬇️

Digital Product Record

This connection allows physical products to interact with digital business systems.

🏪 Where Are Product Identifiers Used?

🛒 Retail

Retail stores use product identifiers to connect products with point-of-sale and inventory systems.

When a product is scanned at checkout, the identifier can be used to retrieve the relevant product record.

📦 Inventory Management

Warehouses can use identifiers to track:

• Stock received
• Stock stored
• Stock moved
• Stock dispatched
• Stock sold

🌐 E-commerce

Online marketplaces and e-commerce systems often use product identifiers to organize product listings and distinguish products.

🚚 Supply Chain

Manufacturers, distributors, warehouses and retailers need a common way to refer to products as they move through the supply chain.

📊 Business Analytics

Product identifiers can also help businesses connect sales, inventory and operational data to specific products.

🏷️ What Are Common Types of Product Identifiers?

🌍 GTIN

GTIN stands for Global Trade Item Number.

It is a family of standardized product identifiers used within the GS1 system.

Common formats include:

• GTIN-8
• GTIN-12
• GTIN-13
• GTIN-14

🇪🇺 EAN-13

EAN-13 is commonly used to refer to the 13-digit GTIN-13 format.

It is widely used for retail product identification.

🇺🇸 UPC-A

UPC-A is commonly associated with GTIN-12, a 12-digit format widely used in North American retail.

🖨️ Barcode

A barcode is a machine-readable representation of information.

For example, a GTIN can be represented in a suitable barcode symbol.

It is important to understand:

A barcode and a product identifier are not exactly the same thing.

The identifier is the data. The barcode is a machine-readable representation of that data.

🔎 Product Identifier vs Barcode

🧠 Think of It This Way

Product Identifier

= The identity/reference

Barcode

= The machine-readable representation

For example:

GTIN

⬇️

EAN-13 Barcode

⬇️

Barcode Scanner

⬇️

Retail System

The scanner reads the barcode and the system uses the decoded identifier to retrieve the relevant product information.

🧮 Why Does a Check Digit Matter?

✅ Error Detection

Many standardized product identifiers contain a check digit.

A check digit is calculated using a defined mathematical method.

Its purpose is to help identify certain errors in the identifier.

🔢 Example Concept

Suppose an identifier contains:

123456789012X

The final X can be a calculated check digit.

If the preceding digits are changed incorrectly, the resulting check digit may no longer match.

This provides a useful validation mechanism.

🧴 Why Does Every Product Variant Need Careful Identification?

📏 Different Sizes

A 100 ml product and a 200 ml product may need separate identification.

🎨 Different Variants

Different colours, flavours or versions may need separate product records.

📦 Different Packaging

A single item, multipack and case can represent different trade items depending on the business context.

🌍 Different Markets

Product identification requirements can vary depending on the market, retailer, marketplace and supply chain.

Therefore, businesses should not assume that one identifier automatically covers every product configuration.

🔗 How Does a Product Identifier Connect to a Database?

💻 Identifier → Record

A product identifier becomes particularly useful when it is connected to a digital record.

For example:

Product Identifier

⬇️

Database Search

⬇️

Product Record

⬇️

Product Information

The information displayed depends on the database or platform.

It could include:

• Product name
• Brand
• Product category
• Size
• Description
• Registration information
• Inventory information
• Other business data

🔍 Can a Product Identifier Prove Authenticity?

⚠️ Identification and authentication are different

This distinction is extremely important.

A product identifier tells a system which identifier is associated with a product record.

It does not automatically prove that the physical item is genuine.

🛡️ Authentication Requires More

A product authentication system may use additional information such as:

• Registration records
• Product data
• Serial numbers
• Security features
• Verification history
• Manufacturer information

Therefore:

Identification ≠ Authentication

But product identification can be an important component of a broader verification or authentication process.

🆔 What Is 91iD™?

🌐 Independent Product Identification & Verification

91iD™ is an independent product identification and verification network designed to give businesses a structured digital identity for their products.

The 91iD™ numbering architecture is:

91 + 7-Digit Company ID + 3-Digit Product ID + Check Digit

🔢 Example

91 1234567 001 X

Where:

• 91 = 91iD™ prefix
• 1234567 = Company ID
• 001 = Product ID
• X = Check Digit

This structure provides:

9,999,999 possible Company IDs

and

999 Product IDs per Company ID

giving a theoretical capacity of approximately:

9.99 billion product identities.

🔎 How Does 91iD™ Give a Product an Online Identity?

🌐 Product → 91iD™ ID → Online Record

A registered product can be associated with a digital record within the 91iD™ platform.

The basic concept is:

🏭 Company

⬇️

🆔 Company ID

⬇️

📦 Product

⬇️

🔢 Product ID

⬇️

🔍 91iD™ Identifier

⬇️

🌐 Online Product Record

This creates a structured connection between a physical product and its online identity.

🏢 Who Can Benefit From Product Identification?

🏭 Manufacturers

Manufacturers can organize products and product variants using structured identifiers.

🌱 Small & Local Businesses

Small businesses can create a digital identity for products and make product information easier to organize.

🛍️ E-commerce Sellers

Online sellers can connect product records with their digital product catalogue.

📦 Distributors

Distributors can use product identifiers to organize product information across their operations.

👥 Customers

Customers can use available online product information to learn more about a registered product and, where supported, verify its associated record.

⚠️ 91iD™ and GS1 GTIN Are Different

📌 An important distinction

91iD™ should not be described as a GS1-issued GTIN.

GS1 GTINs belong to the GS1 identification system.

91iD™ is an independent product identification and verification system with its own numbering architecture.

A business should always check the specific requirements of:

• Marketplace
• Retailer
• Distributor
• Supply chain
• Export market
• Target country

before deciding which product identifier it needs.

📊 Product Identifier vs Barcode vs 91iD™

🧠 Quick Comparison

🚀 Why Product Identification Matters in Modern Commerce

🔗 Connecting Physical and Digital Products

Modern commerce increasingly connects physical products with digital information.

A product may exist on:

• 🏪 Retail shelves
• 📦 Warehouse systems
• 🛒 E-commerce websites
• 📱 Mobile applications
• 🚚 Distribution systems
• 💻 Business databases

A reliable identifier helps these systems refer to the correct product.

📈 Better Data Organization

Structured identifiers can help businesses organize large product catalogues.

Instead of relying only on product names, businesses can use consistent identifiers to distinguish products.

🔍 Easier Product Search

When an identifier is searchable, users and systems can find the corresponding product record more efficiently.

This is one of the principles behind 91iD™.

❓ Frequently Asked Questions

What is a product identifier?

A product identifier is a number, code or structured reference used to distinguish a product or product variant from other products.

Why does a product need an identifier?

Identifiers help businesses and digital systems distinguish products, organize inventory, manage catalogues and connect physical products with digital records.

Is a barcode a product identifier?

Not exactly. A barcode is a machine-readable representation. The data encoded by the barcode may be a product identifier such as a GTIN.

What is GTIN?

GTIN stands for Global Trade Item Number and refers to a family of standardized trade-item identification formats.

Is EAN-13 a GTIN?

Yes. EAN-13 is commonly associated with the GTIN-13 format.

Is UPC a GTIN?

UPC-A corresponds to GTIN-12.

Does every product variant need a different identifier?

Depending on the identification system and business context, different product variants may require different identifiers. Businesses should follow the requirements applicable to their market and trading partners.

Can a product identifier prove authenticity?

No. Identification and authentication are different concepts. A product identifier can support a verification system, but an identifier alone does not prove that a physical product is genuine.

What is 91iD™?

91iD™ is an independent product identification and verification network that provides structured digital product identities.

How does 91iD™ identify products?

91iD™ uses a numbering architecture containing a 7-digit Company ID, 3-digit Product ID and check digit, together with the 91iD™ prefix.

How can I learn more about 91iD™?

Visit 91id.in to explore the 91iD™ product identification and verification platform.

🌐 Final Takeaway

🆔 Every Product Needs a Clear Identity

A product name tells us what something is called.

A product identifier tells a system which product it is.

A barcode provides a convenient way for machines to capture that identifier.

And a digital product record can connect that identifier with useful product information.

The overall relationship can be understood as:

🏭 Product

⬇️

🆔 Product Identifier

⬇️

🏷️ Barcode / Machine-readable representation

⬇️

📷 Scanner or Digital Search

⬇️

💻 Product Database

⬇️

🔍 Product Information & Verification

For businesses looking for an independent approach to digital product identity and online verification, 91iD™ at 91id.in provides a dedicated product identification network.

🚀 Explore 91iD™

91iD™ | Independent Product Identification & Verification

https://www.91id.in/