A PointLight is the basic positional light. It has no shape and is not visible in the camera or in the pure reflections. It is visible in the volumetric objects though.

Change the PointLight shape
  1. Select the PointLight.
  2. Change the PointLight > Light > Type mode.

A PointLight with its mode set to Point, Square, Disc and Sphere.

The User Guide/Lighting/Positional lights section.