The term Internet meme ( /ˈmiːm/ MEEM) is used to describe a concept that spreads via the Internet. The term is a reference to the concept of memes, although the latter concept refers to a much broader category of cultural information. The earliest known usage of the word meme is in the book The Selfish Gene by Richard Dawkins published in 1976.

An Internet meme is an idea that is propagated through the World Wide Web. The idea may take the form of a hyperlink, video, picture, website, hashtag, or just a word or phrase, such as intentionally misspelling the word "more" as "moar" or "the" as "teh". The meme may spread from person to person via social networks, blogs, direct email, news sources, or other web-based services. An Internet meme may stay the same or may evolve over time, by chance or through commentary, imitations, parody, or by incorporating news accounts about itself. Internet memes can evolve and spread extremely rapidly, sometimes reaching world-wide popularity within a few days. Internet memes usually are formed from some social interaction (Rage comic or reaction faces), pop culture reference (Xzibit in "Yo Dawg" or Bear Grylls in "Better drink my own piss"), or situation people often find themselves in (Socially Awkward Penguin or Futurama Fry / Not Sure If X). Many memes also come from video games (such as the "arrow in the knee" from The Elder Scrolls V: Skyrim). For researchers it's hard to track down the birthplace of memes due to their viral nature, as well as the high chance of the meme spreading to major websites nearly instantly.