x86 Assembly Language Programming

Trying to get a better understanding of data types and how they work. I have seen a few different responses along the same topic here but am still in need of a bit more clarification.

What is the relationship between variables and intrinsic data type? I understand that for example a BYTE sets aside 8-bits of memory for a variable and that a DWORD sets aside 32-bits of memory. Does a BYTE and DWORD have to be an integer? Why can a BYTE be 10h? If so what does the h mean? What are some examples of the following data types:

BYTE

SBYTE

WORD

SWORD

DWORD

SDWORD

FWORD

QWORD

TBYTE

REAL4

REAL8

REAL10