A DDoS attack (Distributed Denial of Service) works by overwhelming a targeted server, service, or network with a flood of internet traffic from multiple compromised sources. The attackers use a network of infected devices, typically referred to as a botnet, to generate excessive requests, causing legitimate users to experience disruptions or complete unavailability of the service. The effects of a DDoS attack can be devastating, leading to financial losses, damage to reputation, and increased operational costs as organizations scramble to mitigate the attack and restore services.