functional testing is a code example

Example 1: functional testing

Functional testing is a kind of black-box
testing that is performed to confirm that
the functionality of an application or 
system is behaving as expected.

 It is done to verify all the functionality 
 of an application works as expected

Example 2: Functional testing

Functional testing team can also 
be called manual testers 
it can also be done by automation team 
(automation functional testing)
Similar to Black box testing or manual testers. 
Just testing the specific functionality of the application. 
Ex. Can user login? Can user logout?