Properties of DES S-Box

Someone is able to explain to me the construction and operation of the DES S-Box, which from n input bits input, produces an output of m bits, with m <n?

I found some material, but I can't understand it:

Thanks in advance for your answers.
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If it isn't cross-posting, can someone remove "meganewbie" messages?
Then, can somebody explain me this part of the algorithm?
Thanks to all.
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