An API, which stands for Application Programming Interface, is a set of rules, protocols, and tools for building software and applications. It acts as a bridge between different software programs, allowing them to communicate with each other. Essentially, an API defines the way in which a developer should request services from an operating system or other application, and how the external service or application responds to that request. APIs are used to enable the integration of systems, enabling new features to be added to existing applications, and to allow the creation of new applications that can leverage services provided by third-party providers. For example, a travel booking website might use an airline’s API to get real-time access to flight data and prices. APIs are crucial in today’s interconnected digital world as they facilitate the seamless operation and enhancement of software and technology products, supporting innovation and new user experiences.