This chapter explores the fundamentals of powders for metaladditive manufacturing and includes descriptions of powdermanufacturing processes, powder properties, and how theproperties affect the powder performance in metal additivemanufacturing processes. The powder manufacturing processeswill be restricted to processes used for titanium alloys andsuperalloys. Related to the powder properties, the reader will beintroduced to both characteristics of discrete particles and as avolume of a larger amount of powder particles and some of themost used standards.