Definition
Replication is the process of creating and maintaining multiple copies of data or a system. These copies can exist on different storage devices, servers, or even geographic locations. This redundancy ensures that if one copy becomes unavailable due to hardware failure, corruption, or disaster, other copies can be accessed. Replication is crucial for maintaining business continuity, enabling disaster recovery, and improving performance through load balancing. For instance, a database might replicate its data to a secondary server to ensure continuous operation if the primary server fails. It is distinct from backup, which is primarily for recovery from data loss, whereas replication focuses on availability. Understanding replication is fundamental for IT professionals and appears in domains like data management and system administration on various IT certifications.