This document discusses using the "What's This" tool in IBM SPSS Modeler. The "What's This" tool, which is available on the Help menu, allows users to get information about different nodes and tools as they work. To use it, the user moves their cursor over an item after selecting "What's This" from the Help menu, and information about that item will appear. The document provides an example of using "What's This" to learn about the Anomaly Detection node.