Nursing audit is a process to evaluate the quality of nursing care provided by reviewing patient records and care documentation. It involves collecting information from nursing reports and patient records to assess the quality of care provided based on quality standards. There are two main types of nursing audits - retrospective audits which review care after patient discharge, and concurrent audits which review care while patients are still undergoing treatment. Nursing audits are important for quality assurance and improvement efforts as they help identify areas of good nursing practices as well as areas needing improvement by comparing actual care provided to established standards.