A DDoS (Distributed Denial of Service) attack is a cyberattack where multiple computers or devices flood a targeted website, server, or online service with excessive traffic. The goal is to overwhelm the system’s resources, causing slowdowns or making the service completely unavailable to legitimate users. DDoS attacks are often coordinated using networks of compromised devices, known as botnets, and can disrupt businesses, organizations, or even entire networks. These attacks can vary in scale and complexity, and defending against them requires specialized security measures to filter or absorb the malicious traffic.