objective-c of the BOOL and bool What is the difference

I'm just a novice obj-c, see obj-c, there are two definitions of boolean type BOOL and bool, do not know what is the difference between the two, please expert advice.

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BOOL two values ​​is YES and NO, bool is true and false. . .
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cited a floor gssnail reply:

BOOL two values ​​is YES and NO, bool is true and false. . .

oh, thank you very much
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cited a floor gssnail reply:

BOOL two values ​​is YES and NO, bool is true and false. . .

There is a problem, we usually bool it should be more or native obj-c of BOOL use?
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These two types are differentiated:

Value BOOL only take the highest position to make a judgment, for example, two 229 5 is 0x101, for BOOL is YES, 4 2-band is 0x100, for BOOL is NO

But do not comply with this rule seems pointer

bool value, and direct access to zero and non-zero.
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BOOL is Apple's own seal it!
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Ultimately, a macro
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Look at their definitions, sdk write very clearly.
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No difference, with the assured, but obj-c accustomed to the YES and NO and BOOL