Final answer:
A DDoS attack stands for 'Distributed Denial of Service'. It is a type of cyber attack where multiple compromised computers flood a target system with fake requests or data, causing it to become unavailable to legitimate users.
Step-by-step explanation:
A DDoS attack stands for Distributed Denial of Service. It is a type of cyber attack where multiple compromised computers, often referred to as 'zombies', are used to flood a target system or network with a large amount of fake requests or data, overwhelming its resources and causing it to become unavailable to legitimate users.