A browser extension is a small software program that adds specific features or functionalities to a web browser. These extensions can enhance the browsing experience by providing tools for tasks like ad-blocking, password management, or improving productivity. They are typically available for popular browsers such as Google Chrome, Mozilla Firefox, and Microsoft Edge. Users can easily install browser extensions from official web stores or repositories. Once installed, they integrate seamlessly into the browser interface, allowing users to access their features with just a click. This customization helps users tailor their browsing experience to better meet their individual needs.