Nursing research aims to advance nursing practice and improve patient health through rigorous scientific inquiry. It provides an evidence base for clinical decision-making. Nurses play key roles in conducting research by developing study protocols, coordinating trials, and collecting and analyzing data. Nursing research has evolved from early studies by Florence Nightingale on environmental factors to large-scale clinical trials today. It helps develop new care techniques, assess interventions, and address problems in health delivery, education, and practice.