Ready To Use tools are ArcGIS Online geoprocessing services which use ArcGIS Online’s hosted data and analysis capabilities. You only need to provide a few input features, as all the other data needed for the analysis, as well as the computation, are hosted in ArcGIS Online. You can use these tools to solve diverse spatial and network analysis problems. Tools include viewshed, profile, watershed, routing, directions, and service areas.
The Elevation toolset contains tools that operate on authoritative digital elevation models to derive surface information, such as calculating visible areas and profiles.
The Hydrology toolset contains tools that use elevation data and ancillary information to model the movement of water across the landscape for delineating watersheds and tracing downstream flow path.
The Network Analysis toolset contains tools that allow you to perform analyses on street networks, such as finding the best route across a city, finding the closest emergency vehicle or facility, identifying a service area around a location, or servicing a set of orders with a fleet of vehicles.