  Within the standard cosmological model, the presence of Dark Energy (DE) is
the only structural difference between the early and late times Universe. While
its presence is in full display at late times, it is irrelevant at early times,
especially when all other physical ingredients of the standard model are
contributing to the formation of CMB anisotropies. This makes DE a natural
candidate to try to solve cosmological tensions between measurements from these
two different epochs. We will analyze how DE presence affects relevant
cosmological observables and how it could change them. This will allow us to
discuss how late-time measurements constrain DE models that aim to resolve the
Hubble constant tension and the achievable performances of these models.
