MySQL Replication On The Same Machine

This How To explain the replication in MySQL on the same machine.

You have large hits, with database driven site and performance, redundancy, security now comes in mind. DBA is now input by many fingers to seek some good solution to make happy faces. So here comes words like Cluster, Replication, Backup, Fail Over and others. So what these are? We currently discuss Replication in terms of a web based database driven site for large hits.