Quality attributes are the different aspects of a product that go beyond functionality. When you're thinking about a testing strategy for a large product, you're not just looking at functionality—you’re thinking about security, performance, and other aspects that might be important. In the same way, we need to look at what quality attributes matter not only for the product but also for different people, like ops, developers, and product owners. By identifying these attributes, we can spot potential threats to quality in different places.