The document discusses the four basic types of computers: super computers, mainframe computers, minicomputers, and microcomputers. Super computers consist of tens of thousands of processors able to perform billions of calculations per second. Mainframe computers are large, reliable machines used by large organizations for mission critical applications. Minicomputers are smaller than mainframes but larger than microcomputers, and are used as small or mid-range servers. Microcomputers, now commonly called personal computers, are designed for individual use and are the smallest type.