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Application Programming Interfaces (API) have become something commonly widespread for a lot of applications. They are used to make a central implementation of business logic requirements, which can then be easily maintained, changed, and used from multiple clients implemented in different stacks of technologies. A typical end user might not be informed about the existence of APIs, but he is most likely enjoying the benefits of APIs. Knowing that there are very popular applications that have public APIs which you can leverage for your applications, it is time to think using them a lot more.