Exploratory testing is a type of software testing where the tester has the freedom to explore the software and test it in any way they see fit, without being bound by a predetermined test plan. It is a form of manual testing that is often used to uncover unanticipated behaviors or issues in the software. This approach allows the tester to think creatively and use their knowledge and expertise to identify potential problems that may not have been uncovered through more structured testing methods.