# Primitive collider shapes

> Primitive collider shapes are built-in, pre-calculated collider shapes in Unity (Box, Sphere and Capsule colliders).

Primitive colliders are defined by simple geometric shapes with a low number of polygons. They match Unity’s [Primitive Objects](/engine/6000.3/manual/working-with-gameobjects/gameobject-fundamentals/primitive-objects.md), which are built-in GameObject shapes.

| **Topic**                                                                                                                                                                      | **Description**                                                               |
| ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | ----------------------------------------------------------------------------- |
| [Introduction to primitive collider shapes](/engine/6000.3/manual/physics-section/physics-overview/collision-section/collider-shapes/primitive-colliders/introduction.md)      | Overview of the primitive collider shapes (Box, Sphere and Capsule) in Unity. |
| [Box collider component reference](/engine/6000.3/manual/physics-section/physics-overview/collision-section/collider-shapes/primitive-colliders/class-box-collider.md)         | Reference page for the Box collider component.                                |
| [Sphere collider component reference](/engine/6000.3/manual/physics-section/physics-overview/collision-section/collider-shapes/primitive-colliders/class-sphere-collider.md)   | Reference page for the Sphere collider component.                             |
| [Capsule collider component reference](/engine/6000.3/manual/physics-section/physics-overview/collision-section/collider-shapes/primitive-colliders/class-capsule-collider.md) | Reference page for the Capsule collider component.                            |