Maya User's Guide: Smooth polygon meshes

Smooth

Smoothing Polygons in MaYa part 1/2 – Pedram Khoshbakht

Maya User's Guide: Render a smooth polygon mesh using Smooth Mesh

Topology Guides

How to get a smooth look like this (mesh, blender, 3D) - Quora

Autodesk Maya Online Help: Bridging between edges

Maya Help, Smooth mesh preview overview, Smooth

Unity - Manual: Model tab

Maya User's Guide: Influence multiple meshes