PDHPE (Personal Development, Health and Physical Education) is a key learning area in NSW schools that teaches students self-awareness, healthy lifestyle choices, physical activity, and interpersonal skills. It involves developing communication, decision making, problem solving, and maintaining positive relationships. PDHPE also covers sexuality, adopting healthy lifestyles, community health, and having students participate regularly in physical activity. The document advocates for teaching PDHPE because it helps students understand active lifestyles, relationships, personal health, and self-development.