What is an API?
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Why it matters
Almost nothing modern is built alone. Your app sends payments through one provider, messages through another, and reads data from a third. The API is the agreed language between them. A clear, stable API means you can swap a tool, add a feature, or plug in a partner without rewriting half your product. A messy one becomes the thing that slows every future change.
A request and a response
Think of an API like a menu. The provider lists what you can ask for and what you must supply; you send a request and get back a structured response, usually as JSON. You do not need to know how their kitchen works, only what to order and what arrives. That separation is what lets teams build on each other's software safely.
How we use them
On client work we connect products to the services they depend on. We have integrated TikTok and Meta marketing APIs to pull campaign data, and built a notification service that fans the same event out across Slack and Teams. When two systems need to react to each other in real time rather than on a schedule, an API is often paired with a webhook so the other side gets told the instant something changes. Most SaaS products are, at heart, a well-designed API with a screen on top.