There are two knobs usually located under the sink. One is for Hot water and the other for cold water - it is where you can directly turn off water on the Sink or Dishwasher with out affecting the rest of the house.
EDIT 9-2-2017 see the Additional Causes listed below the picture.
They look like this:
If you now have water to your Dishwasher and no water from the faucet.
1: Single Handle Faucet ? Then the Faucet unit could be bad - there is usually a cartridge fitting that you can replace.
2: You do not state if it is a new install or older install - it could be the handle is not properly attached to the cartridge .. on a single handle there is usually a screw that fits into the handle mechanics - it may have backed out or is broken.
You could have pinched the lines to your faucet if it was a new install and using PVC line - UNLIKELY but doable.
I would not suspect a clogged aerator even though it is possible - you would notice a trickle effect and if this is the case - buy a new faucet and install a filter on the lines - too much sediment and garbage in your water line.