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Once upon a time when landline was in vogue we were not familiar with all the buttons on the telephone set. Back then we were familiar with ordinary people, not just one and zero buttons. However, those who locked the phone were familiar with the hash (#) and star (*) buttons on the telephone set. Later these two buttons were introduced when mobile phones came to our country. These two buttons were needed to recharge the mobile phone and check the balance. But in addition to dialing in the last few years we are seeing a use of the #button, which is being used extensively on social media. And that is to use it to unite any event or topic. We often see statuses or pictures with hashtags (#tags). Many people do not understand why there is a hash (#) behind this status or photo. In fact, it is called a hashtag in the language of microblogging. It unites similar statements. For example: Ekushey Book Fair is coming up. Now if someone uses #EkusherMela to give information or a statement about the fair, then it should be understood that there are more statements or information related to this hashtag. When you use a hashtag (#tag) at the beginning of a word, it will turn blue. That means it will become a link. If all these related statuses or pictures are given later using the same hashtag, then social media users will easily find them all in one place. In other words, it is an initiative to unite everyone's opinion. One thing to keep in mind, however, is that there should be no space in the word used when using hashtags. It cannot create links if there is space. Hashtags are more commonly used to protest something. Lately, however, its various uses have increased. Nowadays it is also being used extensively in movie promotion. Again, someone does the same thing to give priority to a subject. Some people can do this just to chat inside themselves. The use of hashtags began on the microblogging site Twitter. Later in June 2013, it started to be used on Facebook. Now its use can be seen in Google Plus. The popularity of hashtags grew so much that the word 'hashtag' finally appeared in the Oxford English Dictionary in June 2014.