Definition and Meaning of Exploratory Testing
Exploratory testing can also be called adhoc testing, but in reality it is not quite the same.
In turn, exploratory testing is synchronous learning, test design, and test performing. Exploratory testing is testing without beforehand prepared scenarios.
Therefore exploratory testing is often criticized - as software testers should give up planning and preparation.
To put it differently, exploratory testing is any software testing done to the extent that software tester proactively controls the design of the tests and uses received info to design better tests.
Exploratory testers are not only keying in random data, but rather testing sections that their experience tells them are significant and then going where those tests take them.