"Exploring dark sectors @FASER: ForwArd Search ExpeRiment at the LHC

New physics has traditionally been expected in the high-pT region at high-energy collider experiments. If new particles are light and weakly-coupled, however, this focus may be completely misguided: light particles are typically highly concentrated within a few mrad of the beam line, allowing sensitive searches with small detectors, and even extremely weakly-coupled particles may be produced in large numbers there. In this talk I will discuss the status of FASER, ForwArd Search ExpeRiment at the LHC, a small, and inexpensive detector which will be placed 480 m downstream of the ATLAS interaction-point in the very forward region. Operating concurrently with the LHC, FASER will have a new physics discovery potential in a swath of currently unconstrained parameter-space which is competitive or complementary to much larger proposed experiments. I will survey recent theoretical work as well several experimental developments.