# API

> Application Programming Interface — a set of rules allowing different software applications to communicate and exchange data.

Category: Infrastructure

Source: https://chipp.ai/ai/glossary/api

An API (Application Programming Interface) is a set of protocols, tools, and definitions that allow different software applications to communicate with each other. APIs define how software components should interact, enabling developers to build on existing services without understanding their internal implementation.

In the context of AI agents, APIs are essential for: connecting AI models (calling GPT-4, Claude, or other LLMs via their APIs), integrating external tools (CRMs, calendars, payment systems), accessing data sources (databases, knowledge bases, web services), deploying agents (embedding chat widgets, connecting to WhatsApp), and managing agent configurations (programmatically creating and updating agents).

Common API types include: REST APIs (the most common, using HTTP requests with JSON data), WebSocket APIs (for real-time communication like streaming chat), GraphQL APIs (for flexible data queries), and Webhook APIs (for event-driven notifications).

For AI agent builders, APIs unlock the full potential of their agents. Custom actions on platforms like Chipp allow agents to call external APIs during conversations — booking appointments, creating records, sending emails — all through the AI agent's natural conversation interface.

Understanding APIs isn't required for no-code AI builders, but it enables more powerful integrations. Platforms like Chipp abstract API complexity behind visual builders while offering full API access for developers who want deeper customization.

## Related Terms

- [Webhook](https://chipp.ai/ai/glossary/webhook.md): An automated HTTP callback that sends real-time data to a specified URL when a specific event occurs in a system.
- [Function Calling](https://chipp.ai/ai/glossary/function-calling.md): The ability of AI models to identify when a conversation requires calling an external function or API, and to generate the structured parameters needed to make that call.
- [AI Agent Webhooks](https://chipp.ai/ai/glossary/ai-agent-webhooks.md): HTTP callbacks that notify external systems when specific events occur in an AI agent's lifecycle, such as new messages, completed actions, or user sign-ups.
- [AI Orchestration](https://chipp.ai/ai/glossary/ai-orchestration.md): The coordination of multiple AI models, tools, and workflows to accomplish complex tasks that require multiple steps and capabilities.

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This term is part of the [Chipp AI Glossary](https://chipp.ai/ai/glossary), a reference of AI concepts written for builders and businesses.

Build AI agents with no code at https://chipp.ai.