Rogue security software is bad software that pretends to be good. It looks like a program that will protect you from viruses, but it actually tries to trick you into giving out your personal information or pay money to get your computer back in working order. Rogue security software can also slow down your computer and cause other problems. It's important to make sure the security software you're using is from a trusted source, so you don't get tricked by this bad software.