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There are two code models;

 1. the small code model and

 2. the big code model.

A small code model is one in which all calls to functions are made with near
calls.  In a near call, the destination address is 16 bits and is relative
to the segment value in segment register CS.  Hence, in a small code model,
all code comprising your program, including library functions, must be less
than 64K.

A big code model is one in which all calls to functions are made with far
calls.  In a far call, the destination address is 32 bits (a segment value
and an offset relative to the segment value).  This model allows the size of
the code comprising your program to exceed 64K.

+--------------------------------------------------------------------------+
|   Note:  If your program contains less than 64K of code, you should use  |
| a memory model that employs the small code model.  This will result in   |
| smaller and faster code since near calls are smaller instructions and    |
| are processed faster by the CPU.                                         |
+--------------------------------------------------------------------------+