Working with animation clips in Unity

 Verbatim extracts from https://learn.unity.com/tutorial/working-with-animation-clips#

Depending on the project, it might be necessary to use animations. Animations are typically created in two ways for Unity projects. The first is through external applications like Maya, 3ds Max, or Blender. These animations are created by an animator who typically exports the files as .fbx. Once imported into Unity, those files need to be set up properly. For example, 3D characters will most likely have a rig — a set of bones that drives the animations. The Import Settings will allow a user to determine which Animation Type the rig will use: Generic or Humanoid.