HA High Availability is a technology to achieve failover with very less latency. Its a PRACTICAL REQUIREMENT of data centers these days when CUSTOMERS expect the servers to be running 24 hours on all 7 days around the whole 365 days a year - usually referred as 24x7x365. So to achieve this, a redundant infrastructure is created to MAKE sure if one database server or if one app server fails there is a replica Database or Appserver ready to take-over the operations. END customer never experiences any outage when there is a HA network infrastructure.

HA High Availability is a technology to achieve failover with very less latency. Its a practical requirement of data centers these days when customers expect the servers to be running 24 hours on all 7 days around the whole 365 days a year - usually referred as 24x7x365. So to achieve this, a redundant infrastructure is created to make sure if one database server or if one app server fails there is a replica Database or Appserver ready to take-over the operations. End customer never experiences any outage when there is a HA network infrastructure.