  We review recent results on the cosmological models based on the holographic
principle which were proposed to explain the most of the problems occurring in
the Standard Cosmological Model. It is shown that these models naturally solve
the cosmological constant problem and coincidence problem. Well-documented
cosmic acceleration at the present time was analyzed in the light of
holographic dark energy. In particular, we showed that in the model of Universe
consisting of dark matter interacting with a scalar field on the agegraphic
background can explain the transient acceleration. We also study the impact of
ideas on the physics of entangled states in these cosmological models.
Entanglement entropy of the universe gives holographic dark energy with the
equation of state consistent with current observational data.
