The nursing process is a systematic problem-solving approach used by nurses to plan and provide care. It involves five steps: assessment, diagnosis, planning, implementation, and evaluation. Assessment involves continuously collecting subjective and objective data about a patient's health status through various methods like observation, interviews, and physical exams. This data is then organized, validated, and documented before moving to the diagnosis step. The nursing process ensures continuity of care and allows for individualized, collaborative, and outcome-focused care for patients.