Quality refers to excellence of a product or a service, including its attractiveness, lack of defects, reliability, and long-term durability. Quality assurance provides the mechanisms to effectively monitor patient care provided by health care professionals using cost-effective resources. Quality is defined as the extent of resemblance between the purpose of healthcare and the truly granted care. The main function of the quality department in a hospital is to implement quality system & to establish quality and safety culture. Improvements are based on many, small changes rather than the radical changes that might arise from Research and Development. As the ideas come from the workers themselves, they are less likely to be radically different, and therefore easier to implement. Small improvements are less likely to require major capital investment than major process changes. All employees should continually be seeking ways to improve their own performance. It helps encourage workers to take ownership for their work, and can help reinforce team working, thereby improving worker motivation. Patient safety is a new healthcare discipline that emphasizes the reporting, analysis, and prevention of medical error that often leads to adverse healthcare events. The frequency and magnitude of avoidable adverse patient events was not well known until the 1990s, when multiple countries reported staggering numbers of patients harmed and killed by medical errors. Recognizing that healthcare errors impact 1 in every 10 patients around the world, the World Health Organization calls patient safety an endemic concern.