API services are a means for an application to interact with a server-side system to retrieve and update data. In addition to this, REST API (also known as RESTful API) is an application programming interface (API or web API) that conforms to the constraints of REST architectural style and allows for interaction with RESTful web services. It should be noted here that an API is an interface that allows you to build on the data and functionality of another application, while a web service is a network-based resource that fulfills a specific task. You can use EdrawMax Online to create a similar-looking API service diagram for your usage.
