Hashtags are these: #SquibTip, #SMMW17, #socialmediamarketing. 
 
While the word “hashtag” may seem obtuse, it turns out the word is rather literal. Americans call this symbol, #, a pound sign; the Brits call it a “hash.” A tag is a phrase that gets added on to the end of something, often to put a “button” on the main content. (You hear the term used a lot in music. Badumbum a common tag added onto the end of a song or joke). A tag also refers to something that marks something (i.e. grafitti, indexing notes, etc).