Definition
Failover is a process where a secondary system automatically takes over the functions of a primary system if the primary system fails or becomes unavailable. This ensures continuous operation and minimizes downtime by seamlessly switching to a redundant component. In practice, failover mechanisms constantly monitor the health of primary systems and are pre-configured to activate backup resources when needed. It is crucial for maintaining business continuity and user accessibility, especially for critical applications. For instance, a website experiencing server failure can instantly redirect traffic to a standby server to prevent service interruption. This differs from simple redundancy, which provides backup components but does not automatically switch operations. Failover concepts are frequently assessed in IT infrastructure and cybersecurity certifications like CompTIA Network+ and AWS Certified Solutions Architect Associate.