What is the use of typedef?

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typedef is for defining something as a type. For instance:

typedef struct {
  int a;
  int b;
} THINGY;

…defines THINGY as the given struct. That way, you can use it like this:

THINGY t;

…rather than:

struct _THINGY_STRUCT {
  int a;
  int b;
};

struct _THINGY_STRUCT t;

…which is a bit more verbose. typedefs can make some things dramatically clearer, specially pointers to functions.

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