Quality it's a subjective concept, is the way of being, is the property of qualifying the most diverse services, objects, individuals etc. From Latin qualitate.
Quality is related to the perceptions of each individual and various factors such as culture, product or service provided. Needs and expectations directly influence this definition.
Quality can be the quality of life of people in a country, the quality of the water you drink or the quality of the air you drink. breathes, quality of service provided by a particular company, or quality of a product in the general. As the term has several uses, its meaning is not always clearly and objectively defined.
Quality in relation to products and/or services, there are several definitions for quality, such as the product being in compliance with customer requirements, having added value, something that similar products do not have, cost/benefit ratio, etc.
There is also quality control, quality assurance and quality management are concepts related to quality in industry and services. The concepts are used in several areas, through quality indicators and standards, such as ISO 9001, ISO 14000 and others.