What are Hashtags?
Hashtags are keywords preceded by a hash, or pound, symbol “#”. This makes them both searchable and linkable on Twitter.
Hashtags do not include spaces and are not case-sensitive. It is possible to “follow” or search for a hashtag. By using a hashtag it is possible for your tweet to be seen by other users who do not follow you, exposing your brand to a new market.
Now that you know what a hashtag is, why don’t you check out, Top Trending Twitter Hashtags And The Best Way To Use Them or this Simple Guide to Hashtags.