Varchar2(size)
Varchar2 datatypes are variable length character strings. The maximum length of varchar2 datatype is 4000 bytes.The size must be specified and they can store alpha-numeric values. As like char datatype, blank spaces are not padded to the length of the string. Consequently this is more preferred than character datatypes because it does not store the maximum length.
Syntax
Varchar2(Size)
Example:
X varchar2 (10) stores upto 10 characters of data in the X column.