| Base Of Difference | nchar(3) | char(3) |
| Size | It will take 6 bytes 2 bytes for every charcter | It will take 3 bytes 1 bytes for each charcter |
| Character Type | It will store unicode character as well like chinese , some curreny types and some other unicode values other then english and number system. | This will only takes numeric and aplhanumeric charcters like a-z,A-Z and 0-9. |