---
title: "What is Application Programming Interface (API)?"
url: https://fibr.ai/glossary/application-programming-interface-(api)
description: "An API is a set of rules enabling different software systems to communicate and exchange data seamlessly."
last_updated: 2026-05-05T11:55:55.826555+00:00
---
An API is a structured way for two or more applications to share data and functions. It defines clear requests and responses, making it possible for systems like payment gateways, CRMs, and analytics platforms to work together seamlessly.

APIs are the foundation of integrations, enabling automation and scalable product development. Without them, most modern digital experiences would not exist.

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