What's The Difference Of Between Each RAID Level?

The RAID is a method in which group of disks is combined together, they are actually working separately but for the operating system, these disks are like a single logical drive.
There are 6 RAID levels:

Level 0:
There is no redundancy.
In this parallel access of the data is possible.
If there are many disks then more will be the speed.
There is no need of even disks.

Level 1:
In this level two copies of data is stored on similar drives.
At one time from two disks reading can be possible.
The updating will be occurred in parallel form.
The data recovery method is simple.

Level 2:
In this the hamming code method is used for the error correction.
Extra disks are added for the purpose of error checking.
All the disks are accessed when reading or writing occur.

Level 3:
In this there is one redundancy disk. In this for the individual bits, at the same position the simple parity is calculated.
Only one I/O operation is possible

Level 4:
In this the multiple disks can support multiple I/O operations at the same time.
There is a simple bit by bit parity.
Parity disk turn into a bottleneck.

Level 5:
In this parities are distributed on all the RAID disks.

Level 6:
In this even and odd parities are used.
If error comes in one parity then it can be retrieved from another parity.