Tags: A group of descriptive words which provide a useful way to tell readers what a post is about. They simply make it easier for people to find your content.
WordPress Support – What Is A Tag?
For those of us who love using Twitter, yet hate the fact that it is so hard to find tweets or used hashtags, from not too long ago but that by now are long gone into the Twitter universe.
Fortunately for those brands, businesses, or people that are dependent on Twitter, and face the battle of trying to backup your tweets, there is a free WordPress plugin created for this.