Grey box testing

Grey box testing is a type of software testing that looks at the structure of a piece of software and how it works. It's kind of like a combination of black box testing (which looks at what the software does) and white box testing (which looks at how the software is built). Grey box testing is done by testing experts who look at the software from both the user's point of view (black box testing) and the developer's point of view (white box testing) to find potential issues and make sure the software works as expected.