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API stands for Application Programming Interface. API provides applications with a standardized way to communicate with each other and exchange information. The types of API can be categorized into three types based on the availability and release policies: Private/Internal APIs, Partner APIs, and Public/External/Open APIs. Composite APIs combine different data and services to improve the overall performance and execution process. APIs unify many processes to speed up the operations for better a user experience, improve the productivity of users and improve end-user satisfaction.