Description: Server redundancy is a critical strategy in computer system architecture that involves the use of multiple servers to ensure service availability and continuity, especially during adverse situations such as DDoS (Distributed Denial of Service) attacks. This technique is based on resource duplication, where several servers work together to handle traffic load and provide a backup in case one of them fails or is attacked. Redundancy not only improves system resilience but also optimizes performance by distributing user requests across multiple servers. In the context of a DDoS attack, where a large volume of malicious traffic attempts to saturate a specific server, redundancy allows traffic to be divided among multiple servers, preventing any single one from becoming a failure point. This ensures that services remain accessible to legitimate users, even under extreme conditions. Additionally, implementing server redundancy may include techniques such as load balancing and data replication, contributing to a more robust and reliable infrastructure. In summary, server redundancy is an essential measure to protect the availability of online services against cyber threats, thus ensuring a continuous and uninterrupted experience for users.