Evidence-based nursing integrates research, clinical expertise, and patient values to guide practice. It involves systematically searching, appraising, and applying research to clinical questions, using frameworks like PICO to formulate focused inquiries and critically evaluate study validity and applicability. In adult care, evidence-based nursing improves patient outcomes by reducing variability and ineffective interventions. It enhances decision-making for complex conditions, facilitates collaboration, and contributes to nursing science by identifying knowledge gaps and generating new research questions.