Baking in Maya and Substance Painter

In simple language, Baking saves information related to a 3D mesh into a texture. The first meshes are transferred onto the second mesh UVs and saved into a texture.

Substance 3D Painter is one of the applications that can read mesh properties and bake them down to a texture. This software can output information like Ambient shadows and surface details variations stored as vector directions, directions, Curvature, and Position.