Decades ago, analysts predicted the death of mainframe computers. However, many public and private enterprises throughout the world rely on rely on the mainframe as the backbone of large-scale computing. For example, the US Census Bureau uses mainframe computers to process data about the nations people and economy. On the other hand, many of todays data centers run on racks of PC servers or large-scale PC server farms.

How are mainframe computers different from PCs?

How are they similar?