This document provides an overview of computer basics and classifications. It discusses that computers are electronic devices that process information like the human brain. Computers are then classified into different types including supercomputers, mainframe computers, mid-range computers, handheld computers, and microcomputers. Microcomputers are further broken down into personal computer types such as desktops, laptops, nettops, netbooks, tablet PCs, pocket PCs, PDAs, and smartphones.