The document discusses different debugging tools for embedded systems including simulators, microcontroller starter kits, and emulators. Simulators model the behavior of a microcontroller in software and are best for testing algorithms within a microcontroller. Microcontroller starter kits contain hardware, programming tools, and sometimes an IDE to enable basic debugging. Emulators most closely mimic the behavior of a real system and allow transparent debugging through connecting directly to a microcontroller.