Machines are part of industries and support industrialization in the world. The machining process generates energy in the form of heat, which changes the temperature of the tool as well as its components. So to control such a rise in the temperature of components coolants are used. Thus, the focus of the study is to know the properties of coolants and their application in various machining processes. The coolants are also known as antifreeze which is used to reduce the rising temperature among the components. There are various types of coolants based on materials, compositions, and orientations. There are various studies on the different types of coolant used in different processes to reduce temperatures. Different studies on the coolants conclude that the coolant is necessary for long machining processes to control the heat dissipated among the machining components. Thus further studies in coolants will help to avoid thermal losses during the machining processes.