What is exploratory testing?

Exploratory Testing is instantaneous learning, test design, and test implementation process. It helps in immediate test planning, analysis, design, and test execution. Exploratory Testing involves synchronized test case design and test execution of an application or system under test. The tester constructs or notes down a test idea to give direction and explore the system while testing. To further make critical, realistic and useful tests for the successful testing of an application. It is often considered as a black box testing technique while others deem it as a test approach that can be applied to any test technique and stage in the development process.