Greases are substances that are used to lubricate surfaces for better movement. Some of the common synonyms for the word 'greases' include lubricants, oils, fats, petroleum jelly, tallow, and wax. Lubricants and oils that are used to reduce friction and wear from surfaces are generally called greases. Petroleum jelly and tallow are used as greases mainly for their water and air-resistant properties. Waxes can also be used as greases to protect metal surfaces from rust and corrosion. Different types of greases are used for various purposes, and their properties are changed to suit the specific needs of different industries. It is essential to choose the right type of grease to improve machine performance and prevent breakdowns.