This document defines and describes various types of software. It discusses system software, which provides basic computer functions, and application software, which users use to perform tasks. Some specific types of application software mentioned include payroll software, student information systems, Microsoft Office applications like Word, Excel and PowerPoint, tax preparation software, and operating systems like Windows, Mac OS X, and Linux. It also defines system software like operating systems, which manage hardware and software resources, and the BIOS, which performs hardware initialization during booting.