Copycat refers to the tendency of humans to duplicate the behavior of others, as expressed in the saying, "monkey see, monkey do." This notably happens in the case of suicide and murder.
Copycat suicides are defined as duplications of suicides due to repeated accounts or depictions of the original suicide on television and in other media. The well-publicized suicide serves as a model, in the absence of protective factors, to the next suicide. They occasionally spread, like wildfire, through a school system, through a community, or in terms of a celebrity suicide wave, nationally.
Therefore it is customary in some countries that media do not report suicides, except in special cases.
In the book, Suicide Clusters (Boston/London: Faber and Faber, 1987), by Loren Coleman, many specific examples of copycat suicides are given.
CopyCat is an alternative "full name" for Cc the cat, a clone from 2001.
See also Meme