The Vertex Offset function allows to move the vertices by offset their position along their normal, positively or negatively.

Indeed in some Data Preparation use cases, it can be necessary to inflate or deflate a mesh, meaning to displace its vertices positively or negatively, because it is easier than actually moving the parts. 

For example when 2 parts are overlapping (creating Z-fighting):

How to

Access the Vertex Offset function from Mesh Menu.

Use the "Inflate" and "Deflate" presets available to offset vertices by a value of +0.1mm or -0.1mm.

NOTE                This is the core function used in the Remove Z-fighting function.