Shape Chef is a PowerPoint feature that provides a variety of pre-drawn shapes, maps, photos, and arrows that can be used in presentations. It contains hand-drawn arrows, country and continent photos, and world maps. To access shapes from Shape Chef, users click the Shape Chef option on the menu bar, open the shapes panel, select a shape, and drag it into the PowerPoint slide. Using Shape Chef is beneficial as it makes presentations more fun, easy to understand, and saves time by providing shapes without needing an internet connection.