API (Application Programming Interface)
A defined way for one piece of software to talk to another. AI models are usually accessed through an API.
It is how developers plug a model into apps, and how tools plug into an agent.
Frequently asked questions
Do I need an API to use AI in my business?
Not for everyday chatting in a website or app, but if you want AI built into your own software or workflows, that connection usually happens through an API. It is how a developer plugs a model into the tools your team already uses.
What is an API in plain English?
It is a defined way for one piece of software to talk to another, like a waiter taking your order to the kitchen and bringing back the result. AI models are typically accessed this way, and tools plug into an agent the same way.
How does an API relate to tool use and MCP?
When an agent uses a tool, it usually calls that tool through an API behind the scenes. MCP is a newer standard that makes those connections consistent, so one tool can work across many different apps instead of needing custom wiring each time.
New to all this? Start with what an AI agent really is, browse the full glossary, or explore the learning hub.
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