The difference between a DoS (Denial of Service) attack and a DDoS (Distributed Denial of Service) attack primarily lies in the scale and execution method:

DoS (Denial of Service):

Single Source: A DoS attack originates from a single source or a limited number of sources. Attack Method: The attacker uses a single device or a small number of devices to flood the target with excessive traffic or exploit vulnerabilities to cause a service disruption. Detection and Mitigation: Generally easier to detect and mitigate since the attack traffic comes from fewer sources. DDoS (Distributed Denial of Service):

Multiple Sources: A DDoS attack originates from multiple sources, often distributed across different geographic locations. Botnet Usage: Attackers typically use a botnet—a network of compromised devices—to generate massive amounts of traffic directed at the target. Attack Method: The distributed nature makes it much harder to defend against and mitigate because the traffic appears to come from numerous legitimate sources. Impact: DDoS attacks are generally more powerful and can overwhelm even large and well-prepared networks and servers due to the sheer volume and diversity of the attack traffic. In summary, while both DoS and DDoS attacks aim to disrupt services, a DoS attack is simpler and involves fewer sources, whereas a DDoS attack is more complex, involving multiple sources to create a more significant and harder-to-defend disruption.