The act of memory modification which can be used by any wizard, by using the spell, "Obliviate" as described in the fictional universe of the Harry Potter series as written by J.K. Rowling.

An Obliviator is the designation for a Ministry of Magic employee who has the task of modifying the memory of a Muggle after witnessing incidents belonging to the magic world.

A Muggle is a term, sometimes used in a pejorative manner, from the fictional Harry Potter series of books that refers to a human who is a member of the non-magical community.