There are eight predefined elementary data types in ABAP:
1) Character string (C)
2) Numeric string (N)
3) Date field (D)
4) Time field (T)
5) Hexadecimal field (X)
6) Integer (I)
7) Floating point number (F)
8) Packed number (P)
We can use these data types as the basis for further data types that we can create either locally in a program or globally in the ABAP Dictionary.