Software refers to a collection of programs, data, and instructions that tell a computer how to perform specific tasks. It is a set of instructions that enable a computer to perform various functions and tasks. Software can be categorized into two main types: system software and application software. System software includes operating systems, device drivers, and utility programs that manage and control the computer hardware. Application software, on the other hand, includes programs designed to perform specific tasks or applications, such as word processors, spreadsheets, and web browsers. Software can be installed on a computer or accessed online through the internet.