  An overview of the ATLAS experiment, its physics program and a selection of
the most important results, based on the data taken in pp collisions at
energies of 7 and 8 TeV in 2011 and 2012, respectively, is presented. The
question of possible changes in our understanding of elementary particles
physics, after a discovery of a new boson of the mass of ~125 GeV last summer,
is addressed. During the current long shutdown, the Large Hadron Collider (LHC)
will be upgraded to allow the LHC experiments to study pp collisions at the
energy of ~13 TeV.The ATLAS plans for future analyses and measurements with the
new data to be taken after 2015, are summarized.
