Question

CAN YOU TELL ME THE USE OF TAG?

Answer 1

For example, on the photo-sharing service Instagram, the hashtag #bluesky allows users to find all the posts that have been tagged using that hashtag. Because of its widespread use, hashtag was added to the Oxford English Dictionary in June 2014. The term hashtag can also refer to the hash symbol itself when used in the context of a hashtag.

Answer 2

tag is use to html they use to web page