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Weak gravitational lensing by the large-scale clustering of matter subtly distorts the temperature and polarization anisotropies of the cosmic microwave background (CMB). These distortions imprint the CMB with information on the late-time expansion, geometry, and clustering that would otherwise be inaccessible with the primary fluctuations alone. In this talk, I will review the tremendous progress that has been made in recent years in observing the predicted effects of lensing in the CMB and discuss applications of this new cosmological probe. In particular, I will discuss the Planck 2015 lensing results, which firmly establish CMB lensing as a precision probe of late-time clustering.