This REST API allows you to work with ready-to-use web services that Esri produces and hosts on ArcGIS Online. These include geocoding services, network analysis services, basemaps, and other thematic map services. Access this API through any language that can make HTTP requests including; Java, .NET, Python, Scala, and many others. ArcGIS is a platform for geographic analysis and mapping that is available in a wide variety of environments and devices, because it exposes much of its functionality through web services. Esri builds and manages information products by providing a platform for geospatial integration and application.