The Self-Care Deficit Nursing Theory, developed by Dorothea Orem, focuses on the individual's ability to perform self-care activities. It emphasizes that people can take charge of their own health by engaging in practices that promote well-being. When individuals cannot meet their self-care needs due to illness or disability, a deficit occurs, requiring nursing intervention. Nurses play a crucial role in identifying these self-care deficits and providing support. They assess the patient's ability to perform self-care and develop personalized care plans. This theory highlights the importance of empowering patients to regain their independence and improve their overall health outcomes.