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Steven Parker227,141 Points
An API is basically just a set of rules for communicating with a service. What the service does, what you can ask of it, the format for making requests, and what you will get back and in what format. Essentially the "instruction manual" for the service.
Using an API (known as "consuming") is the process of writing code that will follow these rules to send requests to and handle responses from the service.
Implementing an API service is the process of writing the code that will provide the service according to the defined rules.
API examples would include a weather service (like openweathermap.org) or a photo image service (like unsplash.com).
API is working Like a Wetter in Rasturant take the orders go to ketschen and bring the food back.