Hashtag definition: the pound sign, or # symbol used to categorize keywords common in Social Media posts. Twitter started using to categorize messages back in 2007 but it’s use has become universal now in Google, Facebook, LinkedIn, etc. to do the same exact thing.
There’s a right way and wrong way to use it so don’t just add a pound sign in front of a word without looking to see if anyone else has used it already! For example, if I want to help brand my business, I can add #6x6Design to my posts on Facebook, Twitter, etc. and that would help others searching or talking about 6x6Design – I wish! – to see related posts involving that hashtag.