An API (Application Programming Interface) is a set of rules and protocols that allows different software applications to communicate with each other. APIs define the methods and data formats that applications can use to request and exchange information. REST APIs use HTTP methods (GET, POST, PUT, DELETE) to interact with resources, while GraphQL allows clients to request exactly the data they need. APIs enable microservices to communicate, mobile apps to connect to backends, and third-party integrations to extend application functionality.
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