An API is a set of codes with rules, structures and objects that define the technical connection between two applications or software and how they should interact with each other. Behind most user interfaces is an API that converts the interaction of the user with the control panel functions into commands, which are then sent to the software telling it what to do.
In the case of Octopoly, when you order a domain name, the order is processed and sent via API to the respective registry of your chosen domain extension.
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