what 's the difference between 586 and pentium chips?

please tell me, what 's the difference between 586 and pentium chips?
and also 486  and pentium?
are the both  product of intel company?

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586 is a more generic term and not the same as Pentium, but they are the same class of cpu.  Pentium is trademarked by Intel, whereas 586 isn't, and Cyrix, for example, had produced a 586.  The 486 class was the cpu immediately before the Pentium and was an improvement over the 386 class, incorporating both cpu and math coprocessor on the same die.  486 and 586 are not Intel-specific, but Pentium is, and there are 686 and 786 chips also: http://users.erols.com/chare/586.htm

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The Pentium name comes from a time when Intel wanted to trademark the 586 name so other companies couldn't use it. But under the current laws, no one could trademark just a number. So Intel used the name Pentium to designate the 586 architecture of their CPU.
I would say a definitive answer has been given.
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