Computer software is a collection of instructions that enable the user to interact with a computer, its hardware, or perform tasks. It can range from system software, which is responsible for the basic functions of a computer, to application software, which is designed to perform specific tasks such as word processing, accounting, or web browsing. It is usually divided into two categories: system software and application software. System software includes operating systems, device drivers, and utilities that enable the user to interact with the computer. Application software is designed to perform specific tasks, such as word processing, accounting, web browsing, or multimedia editing. There are a variety of software packages available to meet different needs, from basic office applications to complex scientific and engineering programs.