What Are GS1 Application Barcode Identifiers?

GS1 Application Identifiers (AIs) are numerical prefixes that specify the meaning, format, and length of encoded data items.
They are used to decipher the information encoded in a barcode.
All GS1 Application Identifiers are cataloged in the GS1 General Specifications.
See more: https://barcodelive.org/barcode-identifiers