If you add a map service from ArcGIS Online, where will you see it?

When you add a map service from ArcGIS Online, it will appear in the Catalog window. The Catalog window serves as a comprehensive interface for managing and accessing various geographic datasets, including map services, feature layers, and other GIS resources. This feature allows users to organize their data, create connections to services like ArcGIS Online, and manage their GIS project assets efficiently.

In this context, adding a map service directly integrates the service's resources into the Catalog window, making it easy to visualize, manage, and utilize in your GIS projects. The Catalog window is designed for this purpose, which distinguishes it from the other options that are not primarily focused on displaying added services. For example, the Layout view is where you arrange and design maps for print or presentation, and the Data view focuses on editing and interacting with the geographic data in a view suited for analysis. The Toolboxes panel is specific to tools for geoprocessing and does not serve as a repository for data or services.