Air tools please help.?

what the difference between CFM AND SCFM? I am trying to buy a new air compressor and i want to make sure that i am getting one powerful enough to run my pneumatic tools all of them list their air consumption at 5 to 8 CFM @ 90 PSI. the air compressor that i am interested in list it's air delivery at 11.7 SCFM... show more what the difference between CFM AND SCFM?
I am trying to buy a new air compressor and i want to make sure that i am getting one powerful enough to run my pneumatic tools all of them list their air consumption at 5 to 8 CFM @ 90 PSI. the air compressor that i am interested in list it's air delivery at 11.7 SCFM @ 90 PSI. My local home depot associates were no help at all. so can somebody plain explain this to me.
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