Searches for Dark Matter with the ATLAS and CMS Experiments using LHC Run 2 (2015–2018) Data

The presence of a non-baryonic Dark Matter (DM) component in the Universe is inferred from the observation of its gravitational interaction. If DM interacts weakly with the Standard Model (SM) it could be produced at the LHC. The ATLAS and CMS experiments have developed a broad search programme for DM candidates, including resonance searches for the mediator which would couple DM to the SM, searches with large missing transverse momentum produced in association with other particles (light and heavy quarks, photons, Z and H bosons) called $E_{T}^{miss}$ +X searches, and searches where the Higgs boson provides a portal to DM, leading to invisible Higgs boson decays. The results of recent searches on 13 TeV $pp$ collision data, their interplay and interpretation will be presented.