Mutants

Mutants are a race of being from Marvel Comics. They are the third kind of superhuman beings, after Inhumans and Enhanced Individuals.

During prehistoric times, the Celestials arrived and used their powers to alter the evolutionary process of several cavemen. As a result, those cavemen evolved into mutants, men and women born with extraordinary powers and/or physical mutations.

Unlike Inhumans and Enhanced Individuals, humans fear and hate mutants. This is the cause for the Mutant Civil War between the X-Men (who act as superheroes to prove to humans that mutants aren't evil and can be trusted) and the Brotherhood of Mutants (who want to kill all humans so that mutants will rule the Earth).

Incredibly powerful mutants, or mutants with immense power, are known as Omega Level Mutants.

A common misconception is that Deadpool is a mutant due his association with the X-Men, but he is actually an Enhanced Individual (he was given his healing factor in a scientific experiment).