Quality is delighting customers
Here’s an example of that:
Assume that you are testing the Help of any application, and the application has a help page where one help link is given. (Add customer is assumed as a link). In case there is a defect in the link, but it was not found by QA and it went live.
When a user clicks it, this should go to the Add customer form, but a missed bug was residing in it (known as Add cell no). You will get message that Add customer link was not working. Here defect in adding the cell no is the masked defect. But you will get a message that Add customer (link) in help documents was not working.