From mainframes to cloud computing, cloud services have evolved over the years and were mainly driven by the advancements of three hardware pillars, namely: computer systems, storage systems, and data networks. We will look closer into the evolution of these three components in Chapters 3, 4, and 5. However, in retrospect, the eras in this technological evolution span in this way:
Mainframe computing (1960s to 1980s): Large, expensive, and complex
