  This paper summarizes the physics potential of the CLIC high-energy e+e-
linear collider. It provides input to the Snowmass 2013 process for the
energy-frontier working groups on The Higgs Boson (HE1), Precision Study of
Electroweak Interactions (HE2), Fully Understanding the Top Quark (HE3), as
well as The Path Beyond the Standard Model -- New Particles, Forces, and
Dimensions (HE4). It is accompanied by a paper describing the CLIC accelerator
study, submitted to the Frontier Capabilities group of the Snowmass process.
