The Animus is the fictional device that lets Assassin's Creed users access genetic memories.
In the series, the Animus is a machine developed by Abstergo that allows a person to experience ancestral memories encoded in genetic material. The modern-day user remains outside the historical events while the device presents those memories as an interactive simulation. This framing explains how the games move between contemporary scenes and historical settings.
The concept combines science-fiction storytelling with the series' fictional genetic-memory premise. Different Animus models appear over time, including versions used by Abstergo, the Assassins, and later entertainment products. The machine's interface and capabilities change, but its basic purpose remains access to ancestral memories.
The Animus is not an artifact. Pieces of Eden are ancient Isu objects with special powers, while Eagle Vision is an ability used by characters. The Bleeding Effect is a consequence of prolonged Animus exposure, not the machine itself.