Introduction to APIs - What are APIs?

Application Programming Interface (APIs) are essential for exposing that backend in a controlled way, so you can define behaviors to access and manipulate data while maintaining its integrity.

An API is an interface. It’s something that has been created to help two different systems interact with one another.

A key idea to remember is that API functionality is defined independent of the actual implementation of the provider. Essentially, you don’t need to understand the entirety of the application implementation in order to interact with it through the API. This has multiple benefits:

1. It doesn’t expose the implementation to those who shouldn’t have access to it.
2. The API provides a standard way of accessing the application
3. It makes it much easier to understand how to access the application’s data.

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来源： https://blog.csdn.net/BSCHN123/article/details/122169499