An API (Application Programming Interface) is a software interface that allows different applications and systems to communicate with each other in a standardized way. It acts as a bridge between a server and a client application by enabling structured data exchange using HTTP requests, JSON, XML, and defined endpoints.

How an API works:

1. The application sends a request to the API endpoint.

2. The server receives and processes the request.

3. The server returns a JSON response (or other format).

4. The application uses this data to update the interface or run a function.

APIs are used in web applications, mobile apps, payment gateways, logistics systems, map services, social networks, IoT devices, and countless other technologies.

A well built API integration ensures secure data exchange, smooth system communication, automation, scalability, and high performance. Without APIs, modern digital platforms simply could not function.