Fuzz testing, also known as fuzzing, is a software testing technique that involves sending random or unexpected inputs to a program in order to uncover vulnerabilities and bugs.

The goal of fuzz testing is to identify weaknesses in the code that could potentially be exploited by hackers or cause the program to crash. Fuzz testing works by generating a large number of test cases that contain invalid, unexpected, or random data.

These test cases are then sent to the program being tested in rapid succession, with the hope of triggering unexpected behavior.

By observing how the program responds to these inputs, testers can identify areas where the code is not handling input properly, such as failing to validate user input or not handling edge cases correctly. Fuzz testing is particularly useful for uncovering security vulnerabilities, as it can reveal flaws in input validation and error handling that could be exploited by attackers.

Additionally, fuzz testing can help identify bugs that may not be caught by traditional testing methods, such as unit tests or manual testing. Overall, fuzz testing is an important tool in the software development process, as it can help improve the reliability and security of a program.

By using fuzz testing to uncover and fix bugs early in the development cycle, software developers can ensure that their products are more robust and less vulnerable to attacks.