In the world of Wikia, vandalism means that someone puts garbage onto a wiki page and removes the useful content that was already there. This could be a silly change such as replacing the members of a TV gang with names of my little ponies or it could be more serious, such as putting adult images on a wiki that is used by children and teens. It could also be something in the middle, such as someone putting Eric Church lyrics to replace useful content. The above are real examples of Wikia vandalism cleaned up on some wiki by a member of the Khan Academy wiki. Although, not all of these incidents occurred on a Khan Academy related wiki.