MITRE ATT&CK Navigator tool to create heatmaps, which are visual representations of threat intelligence. The presenter demonstrates building heatmaps for various threat actor groups like Sandworm and Lazarus, as well as for software strains such as BlackEnergy and Cobalt Strike, by assigning scores to the techniques they employ. Finally, the video illustrates how to generate a heatmap based on defensive mitigations to identify security coverage gaps, allowing for a prioritized approach to strengthening defenses against specific threats and their techniques.