An element of a culture or behaviour that may be passed from one individual to another by non-genetic means, esp. imitation.
An image, video, etc. that is passed electronically from one Internet user to another.
Like genes, memes replicate, mutate, and respond to selective pressure. However, unlike genes which can only be passed along vertically (from generation to generation) memes can be passed along both vertically (from mentor to student) and horizontally (peer to peer.)