This article does not have any sources. (August 2020)
Many websites, such as wikis (like Wikipedia), forums, and blogs, can be changed by anyone. Because of this, they can be "vandalized" by adding comments or replacing everything on the page with spam, nonsense or other silly content. It is a kind of trolling, and these websites have special users, called administrators, whose job is to remove the vandalism and to block users who do not stop vandalizing.
Examples of physical vandalism include salting lawns, cutting trees without permission, egg throwing, breaking windows, arson, spraying paint on others' properties, tagging,