The plasma spray technology is highlighted in this detailed book. Lately, plasma spray has been in much attention for its varied applicability because of the nature of the plasma plume and deposition structure. The plasma gas produced by the arc comprises of free electrons, ionized atoms, some neutral atoms, and undissociated diatomic molecules and the temperature of the core of the plasma jet may accelerate up to 30,000 K. The gas velocity in the plasma spray torch can be modified from subsonic to supersonic by applying converging-diverging nozzles. Heat transmission in the plasma jet is generally the outcome of the recombination of the ions and re-association of atoms in diatomic gases on the powder surfaces and absorption of radiation. Deriving benefits from the plasma plume atmosphere, plasma spray can be applicable for surface alterations and treatment, particularly for activation of polymer surfaces. Also, plasma spray can be applied to amass nanostructures along with developed coating structures for novel usage in wear and corrosion resistance. Some state-of-the-art studies of developed usage of plasma spraying like nanostructure coatings, surface modifications, biomaterial deposition, and anti-wear and corrosion coatings have been depicted in this book.