1. A Denial of Service (DoS) attack is a malicious attempt to affect the availability of a targeted system, such as a website or application, to legitimate end users. Typically, attackers generate large volumes of packets or requests ultimately overwhelming the target system. In case of a Distributed Denial of Service (DDoS) attack, and the attacker uses multiple compromised or controlled sources to generate the attack.
2. A distributed denial-of-service (DDoS) attack is a malicious attempt to disrupt normal traffic to a web property. Learn about DDoS attacks and DDoS protection.

1. A Denial of Service (DoS) attack is a malicious attempt to affect the availability of a targeted system, such as a website or application, to legitimate end users. Typically, attackers generate large volumes of packets or requests ultimately overwhelming the target system. In case of a Distributed Denial of Service (DDoS) attack, and the attacker uses multiple compromised or controlled sources to generate the attack.
2. A distributed denial-of-service (DDoS) attack is a malicious attempt to disrupt normal traffic to a web property. Learn about DDoS attacks and DDoS protection.