Forty-five years after it was postulated as a key component of the theory of weak interactions, the Higgs boson was discovered at the CERN Large Hadron Collider in 2012. Since that time, many decay modes of the Higgs boson have been observed, indicating couplings of the Higgs boson in good accord with the simplest theoretical expectations. The measurements suggest that the Higgs field has a nonzero amplitude everywhere in space which gives mass to all elementary particles. However, we should not be complacent. We do not know why this occurs, or what new, hidden elementary particle forces drive the Higgs field to a nonzero value. Many theories of the dynamics of the Higgs field have been proposed, but these are not yet distinguished by the current data. In this colloquium, I will describe what we know about the Higgs boson and what we can learn about the mysteries of the Higgs from future, high-precision, measurements of its interactions.