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APIs (Application Programming Interfaces) Overview
An API (Application Programming Interface) is a set of rules and protocols that allows different software systems to communicate with each other. It defines the methods and data formats that applications use to request and exchange data, enabling systems to interact without needing to understand the internal workings of each other.

APIs serve as an intermediary between the client (which can be an app, website, or another service) and the server that provides the service. When you request a service or data from a server (e.g., requesting information from a weather service or sending a payment via an online banking system), you are interacting with the server's API.