A Hashtag is a unique way for categorizing messages on social media and is a very powerful marketing tool. Anyone can create a hashtag. It is recognized with a hash (#).
A Hashtag is used to recognize a trend on social media and helps in social listening. And you can use the trend to advertise your market.
Examples of business and popular hashtags are #Metoo, #BeyoncevsMichaeljackson, #seo, #b2bchat and #smallbiz