C define and typedef

The two keyword used to make subtitution for a word:

#define ptr int*

and

typedef int* ptr;

is same.

#define is used for make a constant. The cosntant is whatever. no ";" included.
typedef is used for make a macro of the same type.

#define name "Lady Gaga"

#define id 12345

#define number int

typedef int number;

typedef number lol;

typedef "po" lola;                // not valid
     

C define and typedef