what does hash tags mean?

[Superbass]

i don't know what does hash tags mean. pls help.

[TrustMe]

Thanks to Wikipedia:

"A hashtag is a word or a phrase prefixed with the symbol #,[1][2] a form of metadata tag. Short messages on microblogging social networking services such as Twitter, Tout, identi.ca, Tumblr, Instagram, or Google+ may be tagged by including one or more with multiple words concatenated, e.g.:

#Wikipedia is an #encyclopedia

Hashtags provide a means of grouping such messages, since one can search for the hashtag and get the set of messages that contain it."

[Namito]

A hashtag is a word or a phrase prefixed with the symbol #. Think of them of keywords.

- People use the hashtag symbol # before a relevant keyword or phrase (no spaces) in their Tweet to categorize those Tweets and help them show more easily in Twitter Search.
- Clicking on a hashtagged word in any message shows you all other Tweets marked with that keyword.
- Hashtags can occur anywhere in the Tweet – at the beginning, middle, or end.
- Hashtagged words that become very popular are often Trending Topics.