A type of network security attack that disables network availability is known as a DDoS (Distributed Denial of Service) attack. This type of attack overwhelms a network or service with excessive traffic, rendering it unavailable to legitimate users. DDoS attacks exploit vulnerabilities in network infrastructure, leading to significant operational disruption. The goal is often to create a service outage or to distract from other malicious activities. This threat poses a critical issue for businesses, especially those relying heavily on online services for their operations and customer engagement.