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What is Quality?
Quality is degree to which a set of inherent characteristics fulfills requirements.
Characteristics : inherent characteristics of a product, process or system related to requirement.
Requirement : need or expectation that is stated, generally implied or obligatory.
Quality Control is the part of Quality management focused on fulfilling quality requirements
Quality Assurance is the part of the Quality Management focused on providing confidence that quality requirements will be fulfilled.
In other words, Quality Assurance means to assure quality in a product so that a customer can buy it with confidence and use it for a long period of time with confidence and satisfaction.
It takes ten or more years to build confidence in your products, but that confidence can be lost overnight.