Plain bearings, also known as bushings or sleeve bearings, are a type of bearing that relies on sliding motion rather than rolling elements to reduce friction between two surfaces. They consist of a simple design, typically a cylindrical sleeve or a surface that supports and guides a moving part. Plain bearings can be made from materials such as metal, plastic, or composites, often with self-lubricating properties. Commonly used in applications like automotive suspension systems, machinery, and heavy equipment, they are valued for their simplicity, low cost, durability, and ability to handle high loads and shock absorption.