Nursing theory is a body of knowledge that provides a framework for nurses to understand and apply their practice. It encompasses various models, concepts, and principles that guide nurses in delivering patient care, promoting health, preventing illness, and addressing the psychosocial needs of individuals, families, and communities. Nursing theories are developed through research, observation, and critical thinking, and they help to inform clinical practice, education, and research in the field of nursing. These theories also provide a basis for nurses to understand the complexities of healthcare delivery and to advocate for the well-being of patients.