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English definition of “tag”

tag

noun [C]     /tæɡ/
a small piece of paper, plastic, cloth, etc. attached to something that shows some information about it: Many of the bibs have a tag sewn into the lining that contains the UPC number. Valuable pieces are marked with a tag describing the item's age and pedigree. The clerks wear black shirts and name tags.
(also smart tag) COMMERCE a small electronic object that is attached to a product in order to give its position, or to stop people from stealing it: Track your deliveries inventories with smart tags. In agriculture, tags are used to track livestock.
IT a series of letters, numbers, or symbols before or after a piece of electronic data that tells the computer how to treat it: The tag is a link that takes you to a web page. To put anything complicated in a web page you have to put it in tags.
→ See also price tag
(Definition of tag noun from the Cambridge Business English Dictionary © Cambridge University Press)
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