Web plugins are small software components that add specific features or functionalities to a web browser or website. They enhance user experience by allowing additional capabilities, such as playing videos, displaying interactive content, or integrating social media. Common examples include Adobe Flash Player and Java Applets. These plugins work by extending the capabilities of the main application, enabling users to customize their browsing experience. They can be easily installed and updated, often from a browser's official store or website. However, it's important to manage plugins carefully, as outdated or insecure plugins can pose security risks.