An application-programming interface is classified as a set of functions that allow the creation of applications, which access the features, or data of an operating system, applications or other service. Many people use API and plug-in integration for a number of reasons, and the implementation of these systems can be very effective. Most digital agencies should be including these services in their media offerings as they help to facilitate a numerous amount of different services and allow for flexibility with the business’s digital platform and operating system. API’s are classified as one of the most commonly used ways of allowing companies to integrate with each other. They contribute to a business ecosystem and programming language that supports many of the digital platforms on which businesses are built and created.