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What is an API?
Do you know what an interface is? It is a interface that enables you to communicate. E.g. a keyboard is an interface that allows you to communicate with your computer. Buttons in an application are also an interface (in this case a graphical one - User Interface / UI).
API, on the other hand, is Application Programming Interface, translated, application programming interface. In more human terms: **a programmatic means of communication used in applications.
Simply put, applications somehow need to send information either within themselves or to communicate with other applications. Depending on the need, we can talk about a closed API (used only inside the application or company) or an open API (made available to the public, not necessarily free of charge).
Currently, thanks to tools such as Optimization/Tools/MakeHQ and Optimization/Tools/Zapier, using the API has become easier for more than just those who can program.