A bar code is a sequence of strokes and spaces of a certain size, with the help of which numbers, letters and other symbols are encoded. Information encoded in the bar code can be automatically read with special devices — bar code scanners.
A bar code (GTIN-13) consists of 13 digits: the first three of which are the prefix of the national organization of the system (in the GS1 Ukraine system, its is 482), the next 6 digits are the registration number of the system user, the next three digits are the number of the product (products) of this user, the last thirteenth digit is а check digit.