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Computer software, often simply referred to as software, is a collection of instructions, data, or programs used to operate computers and execute specific tasks. It is the intangible part of a computer system, distinct from the physical hardware. Software can be categorized into several types, including system software, which manages computer hardware and provides a platform for running application software, and application software, which performs specific tasks for users, such as word processing, web browsing, or data analysis.

Software is developed by software developers using programming languages, which are formal languages comprising a set of instructions that produce various kinds of output. The development process involves designing, coding, testing, and debugging the software to ensure it functions correctly and meets the specified requirements.

There are two main types of software: proprietary and open-source. Proprietary software is developed by companies or individuals and is typically sold or licensed for use. Open-source software, on the other hand, is developed collaboratively and is freely available for anyone to use, modify, and distribute. Both types of software have their own advantages and disadvantages, depending on the specific use case and user preferences.

Software can be installed on various devices, including computers, smartphones, tablets, and embedded systems. It can also be accessed remotely through cloud computing, allowing users to run applications and store data on remote servers. The evolution of software has been driven by advancements in technology, user needs, and the increasing complexity of tasks that computers are required to perform.