What is the difference between a skirting board and architrave?

The difference between a Skirting board and Architrave is the location and the size. The Skirting board is designed to be fitted around the perimeter of a room, fixed to the wall where it meets the floor. An Architrave, however is usually a smaller width than the skirting board, and is fitted around the windows and doorways to cover where the wooden frame meets the plasterboard.