A digital organism is a computer program which is capable of some form of self-replication, or life simulator. A common program used is universe sandbox, of the videogame giant, Valve Corporation. A digital organism seeks to replicate what happens in nature, using various algorithms to change their own coding, and "evolve". Owing to the distinct lack of natural evidence, scientists use them in attempts to prove the theory of evolution.
One of their most well-known proponents is discredited evolutionist Richard Lenski.