How does a cheat stays undetected?

[yumyumlollal]

Hi, i ask myself for a long time now, how does a cheat stays undetected? i readed something about junkcode? but how does it work and why does vac not detect a cheat?

 

[T0JUS]

When you script the cheat, You can add junk code to make it undetectable but also, alot of other things for it to stay undetected

 

[yumyumlollal]

what else can you do to make it undetected?