RAID stand form "Redundant Array of Internet Drivers". It is basically used to increase Redundancy and make the system more Reliable.
The disks in RAID are setup in such a way so as to distribute the data on all the disks but the array is considered as one single disk by the operating system. RAID can be used for different reasons but Redundancy and Reliability is the main purpose of RAID.
Redundancy is the most important factor in the development of RAID for server environments. This allowed for a form of backup of the data in the storage array in the event of a failure. If one of the drives in the array failed, it could either be swapped out for a new drive without turning the systems off (referred to as hot swappable) or the redundant drive could be used. The method of redundancy depends on which version of RAID is used.
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