An R.O. Sander, also known as a random orbital sander, is a power tool used for sanding and smoothing surfaces. It is commonly used in woodworking, carpentry, and other applications where a smooth finish is desired. R.O. Sanders utilize a random orbital motion to sand surfaces. Unlike a traditional orbital sander that only moves in a circular motion, an R.O. sander combines orbital motion with random oscillation, reducing the risk of leaving swirl marks on the workpiece. This random pattern helps to achieve a smooth and uniform finish.