A0 Poster targeted to general public, explaining the Brout-Englert-Higgs mechanism, the Higgs boson, why it is important, how we look for it, the journey of the discovery and what comes after the discovery. Produced by the ATLAS outreach group at CERN. Also available in French. Download the Poster via CDS at CERN: http://cds.cern.ch/record/1697389