"Common Core" is one of the biggest phrases in education today. To many educators and policymakers, it's a big, exciting idea that will ensure that America's students have the tools to succeed after graduation.
But a growing number of conservatives see things differently.
For years, states used their own, state-specific standards to lay out what K-12 students should be learning, for everything from punctuation to algebra. But those standards varied wildly, so the Common Core replaces them with one set of national standards for math and English language arts.