An Internet meme is a concept or idea that spreads "virally" from one person to another via the Internet. An Internet meme could be anything from an image to an email or video file; however, the most common meme is an image of a person or animal with a funny or witty caption. The proliferation of social media has led to Internet memes spreading very quickly and reaching more people.
Many Internet memes use humor and appeal largely to the adolescent and post-adolescent demographic: this demographic is much more likely to discover Internet memes, understand the humor behind them and be willing to forward it on to friends.
One of the most famous Internet memes is "LOLcat," which features cute pictures of cats with witty or funny captions.