Web browsers are software applications that allow users to browse and explore online resources. They act as interfaces between users and the internet, enabling the display of web pages, handling multimedia, and interacting with web applications. Browsers offer features such as bookmarks, browsing history, ad-blocking, and privacy protection, allowing users to customize their browsing experience. Popular web browsers include Google Chrome, Mozilla Firefox, Microsoft Edge, Safari, and Opera, each with different functionalities and availability across various platforms.