Unity helps you simulate physics in your Project to ensure that the objects correctly accelerate and respond to collisionsA collision occurs when the physics engine detects that the colliders of two GameObjects make contact or overlap, when at least one has a rigidbody component and is in motion. More info
See in Glossary, gravity, and various other forces. Unity provides different physics engine implementations which you can use according to your Project needs: 3D, 2D, object-oriented, or data-oriented. This page provides the links to their documentation.
If your project is object-oriented, use the Unity’s built-in physics engine that corresponds to your needs:
If your project uses Unity’s Data-Oriented Technology Stack (DOTS), you need to install a dedicated DOTS physics package. The available packages are: