What is an API and why does the developer keep asking about it? — answered by Engineer Saeed Baatiah
An API is the official door that lets one program talk to another: requesting or sending data in an agreed format. The developer asks about it because it is the difference between a two-day integration and a one-month one. A system with an API can be connected safely in a way that stays stable across its updates. A system without one is connected through workarounds that are more fragile, slower, and need revisiting whenever its interface changes.