What is twitter hashtag?

Hello friends please tell me what is twitter hashtag.
Thanks.

 

Twitter users can use that hashtag in their own tweets to add to the larger conversation about that topic. When you click on the link you will see all the latest tweets containing that hashtag, making them easy to find among the millions of tweets sent each day.

 

hash tag used to find your perfect niche

 

hash tag before any word is considered as keyword.

 

Hash tag is a powerful strategy of the Twitter to categrized real time feed of that topic,and help to add your information in that category.Its kind of community for perticular niche.