Let us start with a clear understanding of what hashtags are in twitter.
You may have commonly come across this symbol (#) in the website that has been located against specific topics and comments. This is better known as a hashtag that is used as a means of categorization or classification of topics of discussions. You will come across this symbol commonly when people are responding with their replies and tweets in the website at a time of discussion or trending of topics. This is to bring a relevant category or keyword before the view or notice of the readers. When you are reading the tweets or reply you can see the presence of a word with a hashtag before the same will only represent a category or separate reference. You will definitely find a link on the word and clicking on this will take you to another page related to the topic expressed by the word.