Learn about geothermal energy fundamentals in this 14-minute educational video from Stanford University's Understand Energy program. Explore what geothermal energy is and how it functions, discover its various applications and technologies, examine environmental impacts, and understand future trends in the field. Gain insights from Diana Gragg, Core Lecturer in Civil and Environmental Engineering and Managing Director of Explore Energy at Stanford's Precourt Institute for Energy, as she provides a comprehensive introduction to this renewable energy source and its role in addressing climate change and sustainability challenges.