Monkey testing is a software testing technique in which the tester inserts any random inputs into the software application without using predefined test cases and observes the software program's behaviour to see if it crashes. The goal of monkey testing is to use experimental ways to uncover faults and problems in software applications. Monkey testing is a sort of black-box testing that involves SUPPLYING random inputs to a system in order to check its behaviour, such as whether it is crashing or not. Monkey testing does not necessitate the creation of test cases. It can also be automated, in the sense that we can develop programs or SCRIPTS to produce random inputs in order to test the system's behaviour. When undertaking stress or load testing, this technique comes in handy.

Monkeys are divided into two categories:

• Smart Monkeys: The smart monkeys are those who have a basic understanding of the application. They know which of an application's PAGES will redirect to which page. They also know whether the inputs they're giving are valid or not. If they discover an error, they are wise enough to report it as a bug. They are also aware of the MENUS and buttons.
• Dumb Monkeys: Dumb Monkeys are individuals who are completely unaware of the application. They have no idea where an application's pages will reroute. They give random inputs and are unaware of the application's beginning and FINISH points. Despite the fact that they have no knowledge of the application, they discover bugs such as environmental failure or hardware failure. They also have limited knowledge of an application's functioning and user interface.