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, whether 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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