What is nonlinear animation?
 
 
 

After animating a character with keyframes or motion capture, you can collect its animation data into a single, editable sequence. This animation sequence is called an animation clip.

In Maya, there are two types of clip: source clips and regular clips. Maya preserves and protects a character’s original animation curves by storing them in source clips. You do not use source clips to animate your characters. Instead, you use copies or instances of source clips called regular clips to animate your characters nonlinearly. See Animation clips.

Moving, manipulating, and blending regular clips to produce a smooth series of motions for a character is the basis of nonlinear animation. The tool with which you manage all these aspects of a character’s nonlinear animation is the Trax Editor. See What is the Trax Editor?.