Barcode. Barcodes are product identification tags that can
be read by optical scanners. The system was invented in
1966, and soon after, it was introduced as a universal standard.
Barcodes have been used in supermarkets since 1974
and are widely used in tourism, for example, in connection
with the handling of luggage in airports, in ticketing systems,
in fast-food chains, etc. They have increased the speed
of operation and are essential elements in queue and crowd
management