Fuzzing is feeding random input to a program until it crashes.
Sounds dumb. It is the most effective bug-finding technique in existence.

Here is why it works better than code review:-

A human reads code top to bottom. A fuzzer tries millions of inputs in seconds. A human checks the happy path. A fuzzer tries empty strings, 10MB inputs, unicode, null bytes, negative numbers, nested6
structures.

Real example:- A C program with strcpy(). Looks fine. Code review says fine. Static analyzer says fine. Fuzzer tries a 500-byte string and crashes it in 0.3 seconds. Heap buffer overflow. The buffer was 256 bytes. Nobody checked the length before copying.

The best fuzzers are coverage-guided. They track which code paths have been executed and mutate inputs to reach new paths. Each new path is a new chance to find a crash.

It's a privilege to have access to all these resources, write a line of code, and eventually see it solve a real problem