Greases are semi-solid lubricants which are used instead of oil when the lubricant has to stay in one place or stick to a part.

Greases will not leak out as easily as oils. Also used when the tool cannot be lubricated often or are not accessible during operation.

Greases are used for lubrication to prevent friction and wear, to protect against corrosion, to provide a seal from dirt and water, to provide lubrication that does not leak or drip off the surface to which it is applied, and to lubricate for a long time without breaking down.