ELI5: Explain Like I'm 5

American fuzzy lop (fuzzer)

Alright kiddo, so imagine you have a big toy box full of different toys. Some toys are stuffed animals, some are action figures, some are dolls, and so on. You love playing with all of them, but sometimes you want to make sure they’re really safe to play with.

That’s where American Fuzzy Lop comes in! It’s like a toy tester for computer programs. When a computer program is written, sometimes there are little mistakes inside it that make it not work right. These mistakes are called “bugs”. Just like an old toy with a loose screw or a missing piece, a buggy computer program can be dangerous to play with.

But how do we find these bugs? That’s where American Fuzzy Lop comes in. It’s a special computer program that tests other computer programs to see if they have any bugs. It does this by trying lots and lots of different ways to use the program – just like you might try different ways to play with your toys.

This is called “fuzzing”. American Fuzzy Lop fuzzes a program by randomly changing things about it to see if it breaks. It changes things like the words in a text file, or the numbers in a spreadsheet. Then it sees if the program still works, or if it crashes.

If it crashes, that means there’s a bug in the program! Just like if your toy breaks when you play with it a certain way, that means something is wrong with it. Then the computer programmer can fix the bug and make the program safer to use.

So that’s American Fuzzy Lop – it’s like a toy tester for computer programs, trying lots of different ways to use them and finding any bugs that might be hiding inside.