HIP 41378 is a Sun-like F-type star (about 1.22 solar masses, 6,290 K, 1.30 solar radii), 106 light-years from Earth. HIP 41378 is a rare long-period transiting system whose outer planet is so puffy that a ring system has been proposed. The system hosts 2 confirmed planets on orbits ranging from 15.6 days to 1.48 years. With 2 confirmed worlds, HIP 41378 is a compact system whose resonances, spacing, and formation history are active research topics. Mutual gravitational tugs between the planets can slowly reshape their orbits, preserving clues to the system's assembly. Its low mass makes HIP 41378 b a Neptune- or super-Earth-class world rather than a gas giant.