  Inflation as the leading paradigm depicting the very early universe physics
could leave imprints on the cosmic microwave background (CMB) radiation. Using
currently available CMB observations, we give the tightest constraints on
inflation so far. We discuss the theoretical implications of our results
including the energy scale of inflation, inflaton field excursion, Hubble
expansion rate during inflation, equation of state of inflation, primordial
tensor non-Gaussianity, primordial tensor power spectrum, B-mode anisotropy and
inflationary gravitational wave background.
