To open a model's Import Settings, select the model from the Project window. The Inspector then displays the Import Settings for the selected model.

You can customize how Unity imports the selected file by setting the properties in the following tabs:

Contains settings for 3D models, which can represent a character, a building, or a piece of furniture. In these cases, Unity creates multiple assets from a single model file. In the Project window, the main imported object is a model prefab. Usually there are also several mesh objects that the model prefab references.

For more information, refer to Model Import Settings reference.

Contains settings for rigs (sometimes called skeletons). A rig includes a set of deformers arranged in a hierarchy that animate a mesh (sometimes called skin) on one or more models created in a 3D modeling application such as Autodesk 3ds Max or Autodesk Maya. For humanoid and generic (non-humanoid) models, Unity creates an avatar to reconcile the imported rig with the Unity GameObject.

For more information, refer to Rig Import Settings reference.

Contains settings for animation clips. You can define any series of different poses that happen over a set of frames, such as walking, running, or idling as an animation clip. You can reuse clips for any model that has an identical rig. Often a single file contains several different actions, each of which you can define as a specific animation clip.

For more information, refer to Animation Import Settings reference.

Contains settings for the materials and textures in your model. You can extract materials and textures or leave them embedded within the model. You can also adjust how materials are mapped in the model.

For more information, refer to Materials Import Settings reference.