THE HEAD OF THE NSA ON CYBER ATTACK THREATS
What Is a Cyber Attack?
“Simply put, a cyber attack is an attack launched from one or more computers against another computer, multiple computers or networks. Cyber attacks can be broken down into two broad types: attacks where the goal is to disable the target computer or knock it offline, or attacks where the goal is to get access to the target computer's data and perhaps gain admin privileges on it.”
Definition from CSOONLINE.COM