Abstract: The nitrogen-vacancy (NV) center in diamond has been widely adopted as a quantum sensor, and is now even used in undergraduate instructional labs as a model quantum system. However, despite its ubiquity and popularity, most work has been restricted to measurements of one NV center at a time, or to globally averaged measurements of ensembles of many of NV centers. In this talk I will first introduce quantum sensing with nitrogen-vacancy centers, and will explain its basic principles and the emerging applications. I will then present our experimental demonstration of spatiotemporal magnetic field correlation measurements with pairs of NV centers, including the ability to distinguish between global and local noise sources, and the capability to measure signals of interest using free precession times beyond the apparent single NV coherence time in certain regimes. I will also present recent experimental results demonstrating entanglement-enhanced sensing of magnetic field correlations at nanometer lengths scales using entangled pairs of NV centers. Finally, I will present a new experimental platform we have developed for simultaneously manipulating and independently measuring hundreds to thousands of single NV centers in parallel, including the parallel measurement of many thousands of two-point correlators.