GitHub's interactive Network Graph Visualizer is designed to enhance collaboration by graphically representing the commit history of various users in a network, helping developers keep track of changes across disparate repositories. By selecting a root user, the graph displays all commits in every branch of repositories associated with that user, highlighting contributions from others that are not yet included in the root user's repository. This visualization helps users understand the interconnectedness of repositories and acts as a to-do list for code that hasn't been merged yet. The tool emphasizes the communal nature of coding, encouraging developers to focus on code contribution rather than ownership. The graph is interactive, allowing users to explore different branches and commits by clicking, dragging, and using keyboard shortcuts. The feature aims to break down barriers to collaboration by visualizing the flow of code between repositories, demonstrating the potential of Git to connect separate code bases.