In the Standard Model of elementary particle interactions, the masses of all weak bosons, quarks and charged leptons are attributed to the effects of a single spinless particle, the Higgs boson. Experiments at particle colliders have narrowed the range of possible Higgs boson masses, and future collider experiments are poised to discover the Higgs boson and explore its properties. I will give an overview of this search, highlighting the importance of precise theoretical predictions of cross sections for the signal and background processes.