Among all layered TMDCs those belonging to group V particularly TaS2 and TaSe2 has been most thoroughly investigated in terms of their superconductivity and formation of CDW. These systems are very rich in the sense that each improvement in the resolution or sophistication of the probe has uncovered more subtle behaviour. Recently these materials are getting a lot of attention, since they serve as a model material for understanding the still puzzling data of other highly correlated 2D electronic systems, such as the high-Tc superconductors. They share many physical properties with the HTC cuprates, such as the layered structure and qualitatively similar resistivity and susceptibility.Different materials of TaX2 family have been mostly studied for understanding their electronic structure, superconductivity and CDW. Influence of high temperature and high pressure on the electronic as well as optical properties of these materials is still unknown, which motivated the researcher to carry out the work in this direction.