Browser APIs are sets of functions and protocols that allow web developers to interact with the features of a web browser. These APIs enable developers to create dynamic and interactive web applications by providing access to various browser capabilities, such as manipulating the Document Object Model (DOM), handling multimedia, and managing network requests. Common examples of browser APIs include the Fetch API for making network requests, the Web Storage API for storing data locally, and the Canvas API for drawing graphics. By using these APIs, developers can enhance user experiences and build more complex functionalities within their web applications.