This nutshell on arbitration addresses freedom of contract, federal preemption, and universal arbitrability. It conveys a thorough sense of the relevant case law and applicable rules. It describes the unique features of the various forms of arbitration and covers the current debate about arbitration. In particular, it integrates the Court’s most recent pronouncements into the assessment of the decisional law: Stolt-Nielsen, Rent-A-Center, Granite Rock Co., and AT&T Mobility v. Concepcion.