Backdoor. A backdoor is a computer program that bypasses standard security measure in a computer operating system to access the computer and its data. They secretly take control of a computer system either offline or over a network because they always exploit the operating system's vulnerabilities like system patches and updates. They are a type of RAT (remote administrative tool) and can do just about any thing on a computer system. Some back doors even install themselves as rootkit and will often modify the system's firmware settings for nefarious purposes.
