Lubes are substances used to reduce friction between two surfaces. Oils and GREASES are two common types of lubes. Oils are a type of liquid lubricant that is typically made from petroleum or synthetic sources, while GREASES are a type of semi-solid lubricant that is usually made from a combination of oil and a thickening agent. Both oils and GREASES are used in a variety of applications, such as automotive, industrial, and marine.