如何理解typedef Node * List

各位達人，近日看C?Primer?Plus中的一個單鏈表的頭文件，其中有一個typedef看不大明白。具體情況如下：

/*?list.h?--?header?file?for?a?simple?list?type?*/

#ifndef?LIST_H_

#define?LIST_H_

#include??????/*?C99?feature?????????*/

/*?program-specific?declarations?*/

#define?TSIZE??????45????/*?size?of?array?to?hold?title??*/

struct?film

{

char?title[TSIZE];

int?rating;

};

/*?general?type?definitions?*/

typedef?struct?film?Item;

typedef?struct?node

{

Item?item;

struct?node?*?next;

}?Node;

typedef?Node?*?List;?????//這里把一個結(jié)構(gòu)體?Node?定義成一個指針?*?List，不是很明白，請具體講解一下，謝謝！

/*?function?prototypes?*/

/*?operation:????????initialize?a?list??????????????????????????*/

/*?preconditions:????plist?points?to?a?list?????????????????????*/

/*?postconditions:???the?list?is?initialized?to?empty???????????*/

void?InitializeList(List?*?plist);

/*?operation:????????determine?if?list?is?empty?????????????????*/

/*???????????????????plist?points?to?an?initialized?list????????*/

/*?postconditions:???function?returns?True?if?list?is?empty?????*/

/*???????????????????and?returns?False?otherwise????????????????*/

bool?ListIsEmpty(const?List?*plist);

/*?operation:????????determine?if?list?is?full??????????????????*/

/*???????????????????plist?points?to?an?initialized?list????????*/

/*?postconditions:???function?returns?True?if?list?is?full??????*/

/*???????????????????and?returns?False?otherwise????????????????*/

bool?ListIsFull(const?List?*plist);

/*?operation:????????determine?number?of?items?in?list??????????*/

/*???????????????????plist?points?to?an?initialized?list????????*/

/*?postconditions:???function?returns?number?of?items?in?list???*/

unsigned?int?ListItemCount(const?List?*plist);

/*?operation:????????add?item?to?end?of?list????????????????????*/

/*?preconditions:????item?is?an?item?to?be?added?to?list????????*/

/*???????????????????plist?points?to?an?initialized?list????????*/

/*?postconditions:???if?possible,?function?adds?item?to?end?????*/

/*???????????????????of?list?and?returns?True;?otherwise?the????*/

/*???????????????????function?returns?False?????????????????????*/

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