油 (Grease) is a thick, semi-solid lubricant made from a mixture of oil and a thickening agent. It is commonly used in machinery and automotive applications to reduce friction between moving parts, helping to prevent wear and tear. Grease can withstand high temperatures and pressures, making it suitable for various environments. There are different types of grease, including lithium grease, calcium grease, and synthetic grease, each designed for specific applications. Grease is often applied to bearings, gears, and other components to ensure smooth operation and extend the lifespan of equipment. Proper lubrication with grease is essential for maintaining machinery efficiency.