In this lesson, I learned about the major technological advancements and eras in the field of computer hardware and electronics. This includes understanding the Mechanical Era (1642-1934) and the invention that laid the foundation for computing, such as the abacus and mechanical calculators. and also I learned understanding the Vacuum Tubes era (1935-1946) technology played in early electronic computing system. and the Transistor Era (1947-1962) marked the shift from Vacuum Tubes to Transistor, leading to more efficient and reliable electronicdevices and the Integrated Circuit Era (1963-1972) brought about the development of Integrated Circuit. In the PC & VLSI Era (1972-Present) I learned how to to develop of personal computers and very-large-scale integrated technologyhas had a profound impact on modern computing and that all of this lesson.