A Global Trade Item Number, a.k.a. a GTIN, is a 14-digit string used as a way to exchange chunks of data.
"GTIN barcodes" don't exisit but GTIN numbers are often represented by a barcode. One can put a GTIN into a UPC bar code, EAN bar code, Code 128 bar code, or Interleaved 2 of 5 bar code. A GTIN is not a barcode but how data is stored. Think of a GTIN as a data bucket that can be poured into a barcode.
The globally unique GS1 System item number for products and services. A Global Trade Item Number is 14 digits long and can represented by a barcode. The important thing to remember is that there is no such thing as a "GTIN barcode". GTIN numbers can be represented by barcode but it's a 14 digit number not the container used to encode it.
As the name implies, the GTIN helps automate the trading process — basically buying and selling. GTINs are therefore assigned to any item (product or service) that may be priced, or ordered, or invoiced at any point in any supply chain. The GTIN is then used to retrieve pre-defined information about the item.
— from GS1 US
GS1 US is an excellent online GTIN resource.
Even though it's called a Global Trade Item Number a GTIN should be stored in your database or spreadsheet as a string. If you store a GTIN as a number you won't be able to use GTIN's with leading zeros. They'll be trimmed.
Yes, all of Azalea's fonts and software is GTIN-compliant.
