The DataStax Graph Loader (DGL) is a tool for loading data into DSE Graph, and can also help familiarize users with the platform. This tutorial guides users through creating mapping scripts and functions, using DGL to speed up schema creation, and manipulating data within the tool. It covers working with Pokemon data as an example, including creating vertex labels, defining edges between vertices, specifying input files, and generating a schema for the graph. The final step is loading the data into the graph using the mapping script created earlier.