Ultraviolet and Visible spectroscopy was one of the first instrumental methods for analysis. It may be used to characterise a wide range of materials. The UV-Vis provides information based on the degree of absorption or transmittance of a variable wavelength of beam light and sample responses. The general law known as Beer's law may be used to quantitatively quantify the absorption of radiant energy by materials. The UV-VIS spectrometer is easy to operate and maintain. It may be used in both qualitative and quantitative assessments. Metal and its nanoparticles are commonly measured at wavelengths ranging from 200 to 700 nm. The UV/Vis spectrum can also help us understand the delicate mechanism of complexation between templates, monomers, and cross-linkers during polymerization. It is a rapid, easy, and low-cost characterisation approach. The spectrum may be used to investigate the composition and structure of materials. These findings have applications in academics, business, medical laboratories, and chemical analysis of environmental samples.