Additive Manufacturing (AM) has grown in popularity in the manufacturing sector over the last three decades, particularly for the production of part designs and prototypes due to its flexibility in terms of shape, size, and design of intricate and net-shaped functional parts with no geometrical limitations. The automotive, aerospace, defence, biomedical, and other sectors as well as other applications predominantly use AM methods. Wire and Arc Additive Manufacturing (WAAM) might be an useful alternative way for generating the high-quality, intricate parts that are typically required in these applications since they are not suited for standard manufacturing procedures with long product lead times. The WAAM method has been used with a variety of power sources, including Metal Inert Gas (MIG), Tungsten Inert Gas (TIG), Plasma, and Cold Metal Transfer (CMT). CMT-WAAM is a viable option for large-part production because of its numerous advantages. The various types of recently developed CMT processes are CMT + Pulse, CMT Advanced, CMT Pulse Advanced, CMT Dynamic. To maximize the benefitsof CMT based WAAM, it is necessary to understand the microstructure which is closely related to mechanical properties of the layer deposition. The impact of process parameters such as wire feed, wire diameter, voltage speed, deposition speed, current and argon gas etc. on the microstructure and mechanical properties were analyzed and summarized. The study presented the summary table of published data on the microstructure and mechanical properties of various materials prepared via CMT based WAAM to explore as a quick reference to the researchers.