› 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