How do greases differ from industrial lubricating oils?

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A grease is a semi-fluid or semi-solid lubricant that consists of a mixture of a thickening agent with a liquid lubricant and other elements that give each grease its special properties.

Like other lubricants, it is used to reduce the friction between two surfaces or mechanisms moving relative to each other. As well as reducing wear, they help clean the system of contaminants and seal it.