API (Application Programming Interface).
A defined way for two pieces of software to talk to each other and exchange data.
An API is a contract that lets one system request data or actions from another in a predictable way. When your app shows a map, takes a payment, or sends an email, it's almost certainly calling an API — Google's, Stripe's, or its own.
APIs are what make modern software modular. Instead of building everything yourself, you connect to services that already solved a problem well. They also let your own product expose data to mobile apps, partners, or customers in a controlled way.
A well-designed API is clear, consistent, and stable, so the things built on top of it don't break every time you change something. That discipline is part of what makes a product easy to extend later.
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