  This article reviews the properties of the quantum state of inflationary
perturbations. After a brief description of the inflationary background, the
wavefunction of the Mukhanov-Sasaki variable is calculated and shown to be that
of a strongly squeezed state. The corresponding Wigner function and density
matrix, which are convenient tools to characterize the properties of a quantum
state, are also evaluated. Finally, the issue of definite outcomes for
inflation is discussed.
