Application of the “Retrofit” tool in the development of the software under the Android operating system

This article deals with problems in software development. In particular, the problem will be raised on the expenditure of a large amount of time and effort by the developer in developing a software product. And the study of the possibility of using the tool “Retrofit 2” to send and receive a response from the server via the API, which should allow to save time and effort. The study will be conducted as part of the development of a mobile application for the Android operating system. All examples of the use of the library "Retrofit 2" in the framework of the study will be given in the article.