API
An API (Application Programming Interface) is a set of rules, protocols, and tools that allows different software applications to communicate and exchange data with each other. It defines the methods and data formats that applications can use to request and exchange information, enabling integration between systems without requiring knowledge of their internal implementations.
Developers should learn and use APIs to build scalable, modular applications that can leverage external services, integrate with third-party platforms, and enable interoperability between different software components. APIs are essential for web development, microservices architectures, mobile app backends, and cloud-based services, as they facilitate data sharing, functionality extension, and system automation.