What does the word "hashtag" mean.?

[carole]

[ali khan]

Hi,
# is inserted before the content.For example #test. Say what you mean in few words. #yahooAnswered #hashtag

[schzimmydeenie]

it's this sign --> #
it's used on social media when people want to see all the photos/tweets/content associated with the phrase. Let's say you're interested in a certain celebrity's tweet, by using #(name of celebrity) e.g. #ryangosling, you can see all the tweets associated with him.