What is sata 3 support?

many new motherboards support sata 3 ,some times only this option increase the price of the mother as 890 chipset for amd.
so what is it ?
is it a new slot for new generation of hard drives .
or
an option to increase the speed of sata hard drives.
and
is this option is enough to pay an extra budget to buy a mother with 890 chipset instead of 880 or 785 .

i ll be glade for help
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  1. ok ,can u mention som motherboards that support sata 3.
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