Bit (binary digit)- smallest unit of data in the form of either 0 or 1. Physical electronic components and peripherals of a computer that do the work of computing. Cpu, memory (ram), storage, input devices, output devices. Interprets and carries out basic instructions that operate a computer. Controls other parts of the computer system. Temporarily stores software program(s) being executed, data used by the programs and. Electronic instructions that tell the computer hardware what to do. Software program- series of statements or instructions to the computer. System software- generalized programs, manages computer"s resources. Application software- programs written to perform functions specified by the end users. Set of programs that manages the operations of a computer and functions as an interface. Windows (xp, vista, 7, 8, 10, server) mac os, android, ios, linux, unix, dos, between the user, the application programs and the computer hardware. Provides locations in primary memory for data and programs.