This document provides an introduction and overview of basic computer concepts for a computer essentials course. It defines what a computer is, explaining that computers follow user instructions quickly as calculators. It also defines the components of a computer system and differences between hardware and software. Key concepts covered in 3 sentences or less include: Computers consist of physical hardware that executes software instructions to perform tasks. Hardware includes input devices like keyboards and mice and output devices like monitors and printers. Memory and storage devices are also explained as important components for running programs and saving files.