What is the difference between Sancerre and Sauvignon Blanc?

Sancerre (the region) is made with SAUVIGNON BLANC (the grape). Sancerre is a sub-region of France's Loire Valley that's known for growing Sauvignon Blanc. Sauvignon Blanc from Sancerre tends to taste very crisp and is a bit more subtle vs. New Zealand Sauvignon Blancs, which tend to have stronger flavors.