A rotary razor is an electric shaver that uses rotating blades to cut hair. It typically features three circular heads that move in a circular motion, allowing for a close and comfortable shave. These razors are designed to follow the contours of the face, making them effective for various hair lengths and types. Many rotary razors come with additional features, such as adjustable settings, built-in trimmers, and waterproof designs for easy cleaning. Popular brands include Philips and Braun, which offer a range of models to suit different grooming needs and preferences.