Neutrinos: Challenges and Opportunities

Neutrinos are one of the most abundant of all known particles in the universe, but yet the least understood ones. A rich neutrino physics program is underway, in the US and abroad, with the goal of significantly improving our knowledge of this sector. In this colloquium, I will revisit what sort of physics we expect to learn from neutrinos, and the challenges that we will need to overcome in order to do so. I will highlight the big questions in neutrino physics and the impact of future experiments in answering these.