CONCATENATE command in sap abap

CONCATENATE command
To concatenate separate character strings into one, use the CONCATENATE statement:
Syntax
CONCATENATE … INTO [SEPARATED BY ].
This statement concatenates the character fields to and assigns the result to .
Trailing blanks are ignored during this operation.

CONCATENATE STR ‘:’ STR2 INTO STRING.
Here str, str2 and ‘:’ is concatenated and result is stored in string.