I like to think of a hashtag like a sort of sticky note, but one that you give to someone else.
For example, say you’re in a grocery store and you see a sale on Oreo cookies in the cookie isle. You take a package for yourself and then decide to share your discovery with others.
Verbally, you would tell someone, “Go checkout the sale they’re having on Oreo cookies in Isle 9.”
Using a hashtag, you would write #OreoSale.
Because of the addition of the “#” mark, and the fact that I have no spaces between the words, the hashtag becomes a live link, if posted on a social network like Facebook, Twitter, LinkedIn and Instagram.
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