Testing is a straightforward testing technique that looks for vulnerabilities in a program or protocol by feeding random input to the program or a network running the protocol.

Fuzz testing is a straightforward testing technique that looks for vulnerabilities in a program or protocol by feeding random input to the program or a network running the protocol. Fuzz testing is an automated software testing technique, developed at the University of Wisconsin Madison in 1989 by Professor Barton Miller and his students
 It involves attempt to make the program crash and by doing so, finding the security loopholes of a program.