In Assassin's Creed, the Animus lets modern people experience genetic memories from the past.
The device is a fictional machine that interprets inherited memories encoded in a person's DNA. A user enters the Animus and relives the experiences of an ancestor, allowing the games to move between a modern storyline and historical periods. Desmond Miles is the first major modern character shown using it in the series.
The Animus does not literally transport someone through time. It presents a reconstructed experience based on genetic memory, with the user's consciousness interacting with the simulation. This distinction explains why the series can portray historical events while retaining a present-day plot.
The Animus is often confused with the Helix, which is a later entertainment and research platform within the fictional world. Eagle Vision is an Assassin ability rather than a machine, while Pieces of Eden are powerful precursor artifacts. The device's visual interface and synchronization language became recurring features of the franchise.