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SAN vs. NAS - Block I/O versus File I/O

I checked out several links regarding the difference between a SAN and a NAS and I'm not understanding HOW block I/O is different than file I/O?
I also don't understand why block I/O is better than file I/O?
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Andrew Hancock (VMware vExpert PRO / EE Fellow/British Beekeeper)
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NAS do File I/O, e.g. the file is access through a remote file system, as a file reference. The file is read as a complete file. The file system will ask for the file, and a number of bytes will be read for the complete file.

SAN do Block I/O - when a request comes for a file, it's turned into a request to read several blocks which make up the file.
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