This document summarizes the evolution of integrated circuits and microprocessors from their inception in the late 1950s to recent developments in the multicore era. It discusses how Moore's law drove scaling over the decades, enabling exponential increases in transistor counts. However, Dennard scaling broke down around 2004, necessitating new approaches like multicore designs to continue performance gains within power constraints. Going forward, significant challenges remain to further scaling, suggesting future progress may rely more on heterogeneous architectures and higher parallelism rather than traditional scaling alone.