GS1 offers different types of codes. Which identification code you need depends on what you are going to do with it.
Which code do you need?
GS1 article codes, EAN/GTIN
EAN-13 is the most widely used GS1 code to identify items. Online and in-store. An EAN-13 is found on almost all product packaging, often in the form of a barcode.
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EAN-8
For small retail items where an EAN-13 code doens't fit, use this short 8-digit code. Note: this does not apply to medical devices and pharmaceuticals. For these you always use the EAN-13.
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Global Location Number/GLN
A Global Location Number identifies business venues. You can also code internal locations with GLN. Like a warehouse rack or an agricultural plot. This way you know exactly where something is or comes from.
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Serial Shipping Container Code/SSCC
With a Serial Shipping Container Code you code shipments. The SSCC is assigned to a shipment. Once the shipment reaches its destination and is booked, the shipping code expires.
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Variable price/weight code
If you want to code products with a variable weight - and therefore a variable price - use these codes. Examples include fruit, cheese, scoop candy, screws and meat.