What is 'Black-Box' testing?

Black-box testing is the technique which is basically use to reduce the number of the possible cases of the test and also maintain the test coverage. This type of testing is used in the functional and the non functional requirement of the system.

It is type of testing that majorly focus on the functional requirement. There are many types of black box testing that are:

BVA (Boundary value analysis) Error guessing Decision table testing