Replication is the process of copying data from one place to another. Data can be extracted, transported to some other location, and then loaded at the receiving location. A more efficient way is to extract only those changes since the last processing cycle and transport/apply those to the receiving location.

A organization that wants to build additional backup strategy

A organization who wants to establish a High Availability failover system

HADR
DB2 High Availability Disaster Recovery (HADR) is a replication feature that provides high availability solution for both partial and complete failures. HADR protects data loss by replicating data changes from a source database, called the primary database, to a target database, called the standby database. In case of a failure the takeover by the standby database only takes seconds since the standby database server is already up and running.  HADR also lets you manage planned downtime such as routine maintenance and software upgrades between connected servers.
Implementation of HADR include following steps

• Installation of HADR
• Initializing HADR.
• Database configuration
• Automatic Client reroute
• HADR Performance and monitoring.
  
  

• Project Management
• Database Planning, Installation, and Configuration
• Database Design and Implementation
• Performance and Tuning
• Replication
• Migration and Conversion Services
• Health Check