Plugins are software components that add specific features or functionalities to an existing computer program. By using plugins, users can customize their software experience, enhancing its capabilities without altering the core structure of the application. For example, a web browser can utilize plugins to block ads or manage passwords, making it more efficient and user-friendly. These components are widely used across various platforms, including content management systems like WordPress and audio/video editing software. They allow developers to create a modular architecture, enabling users to choose only the features they need, thus streamlining their workflow and improving productivity.