To protect and safeguard a material from degradation, another material having better properties is applied on the base metal. The application of a coated material can propel the increase in life span, wear resistance or oxidation resistance of a material. Thermal spray coatings play an important role to protect the material from hot corrosion, erosion and wear. As it protects the material from this hazardous environment, it is helpful to increase service life of the material in any surrounding environment. This review paper presents the results of previous work done by different authors in the field of coating.