There are a few definitions of quality, but in general it can be defined as "the degree to which a product or service meets or exceeds customer expectations."
In the context of manufacturing and business, operations are the processes and resources that are used to produce a good or service. The goal of quality operations is to ensure that these processes and resources are effective and efficient, and that the resulting product or service meets or exceeds customer expectations.
There are a variety of tools and methods that can be used to measure and improve quality, including quality control charts, process capability analysis, and six Sigma.