RestTemplate is a robust and Java-based REST client. In Android application development, we can use the RestTemplate module, which will provide a template to request and retrieve a REST API. RestTemplate is Spring's core class for synchronous client-side HTTP access. It's intended to disentangle correspondence with HTTP servers and authorize RESTful standards.

RestTemplate is the main class for synchronous RESTful HTTP requests. A native Android HTTP client library is used to retrieve requests. The default ClientHttpRequestFactory, which is utilized when you make another RestTemplate example, varies depending on the adaptation of Android on which your application is running.