The Animus is the fictional device used to relive genetic memories in Assassin's Creed.
In the series, the Animus allows a user in the present day to access memories inherited through an ancestor's DNA. The user does not literally travel through time; instead, the machine reconstructs and presents the ancestor's experiences as an interactive simulation. This premise connects modern characters with historical protagonists.
Desmond Miles uses an Animus in the first games, while later stories introduce different users and versions of the technology. The device also provides the series with a narrative explanation for modern interfaces, mission objectives, and the ability to revisit historical periods.
The Animus is distinct from Pieces of Eden, which are powerful artifacts left by the ancient Isu. It is also different from the Bleeding Effect, a side effect in which an Animus user's behavior or abilities can be influenced by repeatedly experiencing an ancestor's memories.