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Freestyle is a render engine for creating Non-Photorealistic Line Drawing images from 3D scenes. It is designed as a programmable interface to allow maximum control over the style of the final drawing: the user "programs" how the silhouettes and other feature lines from the 3D model should be turned into stylized strokes using a set of programmable operators dedicated to style description.
Using Freestyle in Blender
See Here for documentation on using Freestyle in Blender.