While the existence of dark matter is inferred through gravitation alone, its non-gravitational physics may hold new surprises. Recent experimental hints point to a more complex dark sector, where new (dark) forces may play an important role. The leading interactions of a hidden dark sector with the Standard Model can be described quite generally in terms of a set of three couplings, known as portals, which form the natural point of attack in probing these scenarios. I will discuss some of the implications of this picture for direct and indirect searches. In particular, the presence of a light force mediator opens a new avenue to probe the dark sector through experiments at the luminosity frontier, e.g. at B-factories, fixed target neutrino experiments and through rare meson decays.