Any API (Application Programming Interface) that follows the REST design principle is said to be RESTful. Simply put, a REST API is a medium for two computers to communicate over HTTP (Hypertext Transfer Protocol), in the same way clients and servers communicate.
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Often, an API is considered a backend “component” . And, for instance, a database can also be treated as another backend component. The APIs you are likely referring to here are web APIs, so could be considered as backend components.
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