There is no doubt that the semiconductor contributed very significantly to changing our world in the long run, which made it very necessary to write this article and shed light on the semiconductor between past and  present. Whereas, this article is not intended to teach you semiconductor chemistry and its applications, but it also aims to refresh your memory with everything related to semiconductors from the moment of sunrise to the present day.As known, people need to communicate with each other in order to meet their daily and professional needs. In the past, the communication process was very difficult and sometimes costly until the emergence of what is known as semiconductors, which in turn opened new purview in the world of communications through its entry into the communication devices industry and computers industry and its ability to processing The data, in turn, facilitated and summarized a very long journey on humans in the field of industry. Today, we are on the beginning of a new sun rise of semiconductor, especially after the emergence of the so-called nanotechnology, where semiconductors have been observed a very large role in the development of this technology, not only but have become Part of the integral ones.

Eriochrome Black T dye is an indicator of complex titration as water hardness, as an azo dye, blue in its deprotonated form, and turns red when it forms a complex with metal ions such as Ca, Mg, Cd . .etc. Water contamination is considered one of the most important problems that threaten human life on earth. An efficient method is done to remove EBT from wastewater via using cadmium sulfide Nanoparticles (CdS NPS) that was prepared by using an inexpensive and simple method (chemical precipitation) and was diagnosed this nanomaterial using an X-ray diffractometer (XRD), Transmission electron microscope (TEM), Scanning electron microscope (SEM) and Energy Dispersive X-Ray Analyzer (EDX). TEM characterization results for CdS nanoparticles illustrated that the nanoparticles have a pointy shape-like needles morphology and with miscellaneous sizes, the statistical calculation gives (32) nm as the rate particle size. Through this study, the CdS nanomaterial proved that it has a high ability to adsorb Eriochrome Black-T (EBT) dye under certain conditions where we noticed that the maximum adsorption capacity of this dye by CdS nanoparticles was at Temperature (293) K, (pH = 6) and at a concentration (0.01 g) of the CdS nanomaterial with contact time up to (40) minutes and CdS. Also calculated the thermodynamic functions, (ΔS, ΔH, ΔG), we found that the process was spontaneous and exothermic under the specific condition through The thermodynamic parameters.