This chapter mainly covers microwave processing equipment and its components, such as microwave source, waveguides, circulators, and temperature measuring unit. The utility of each component is summarized along with the schematic diagram. This chapter describes how the equipment can be designed and used in multimode and single-mode operations for specific materials and applications. This chapter delineates types of applicators at length. The distribution of the E-and H-fields of electromagnetic radiation in applicators is discussed.