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An API, or application programming interface, is a defined way for two pieces of software to talk to each other. One program publishes a list of requests it will answer, and another program sends those requests to read data or trigger an action, without either side knowing the other's internals. APIs are what let your business tools share data: when an AI assistant or another app reaches your CRM, accounting, or email, it is almost always talking to that tool through an API.
Related pillar: Connect your tools to an AI assistant
An API is a contract between two programs. The program that owns the data publishes a list of requests it will answer, each with a known address, a known format, and known rules for who can call it. The program that wants the data sends one of those requests, and the owner responds. Neither side exposes how it works inside. That boundary is the point: a billing system can change its database without breaking the report that reads it, because both sides only speak the API.
Think of an API as a waiter in a restaurant. You do not walk into the kitchen and open the fridge. You tell the waiter what you want from a menu, the waiter relays it to the kitchen, and the kitchen sends the dish back through the waiter. An API is the menu plus the waiter: a defined list of requests, and the courier that carries them. When you ask an AI assistant for this month's revenue, the request goes through the accounting tool's API, the tool reads the number, and the API carries it back.
Every connector, integration, and assistant hook you use is an app built on top of an API. The connector is the convenient layer you actually touch; the API is the mechanism underneath it. A spreadsheet add-on, a dashboard, and an AI assistant can all read the same CRM through the same API, each in its own way. Understanding the API matters because it tells you what a connection can actually do: if the API only exposes read requests, no app on top of it can write.
An API is only as trustworthy as the access it grants, so check three things before you let any app talk to your tools through one. Scope, which records and actions the request can reach, and whether it is limited to reading. Authentication, whether the connection uses a scoped token you can revoke rather than your password. And retention, what the app that calls the API keeps after the request. Read scope, revocable tokens, and a clear retention answer are the three signs a connection is safe.
CorpusIQ is an AI intelligence layer that reads your business systems through their APIs and returns source-cited answers. It connects the 40+ connectors to ChatGPT, Claude, and Perplexity, reads the systems you approve at question time, and takes no actions inside the connected tools. The API is the mechanism; CorpusIQ is the governed way to let an assistant use it for business answers.
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