The document defines what a meme is and provides several examples of popular internet memes. It defines a meme as an idea, belief, or pattern of behavior that spreads within a culture through various means of social transmission. Memes replicate themselves through cultural transmission in a way analogous to how genes replicate through biological transmission. The document also lists some well-known internet memes as examples, such as Pepe the Frog, Cash Me Outside, and Doggo.