  I describe an approach which connects classical gravity with the quantum
microstructure of spacetime. The field equations arise from maximizing the
density of states of matter plus geometry. The former is identified using the
thermodynamics of null surfaces while the latter arises due to the existence of
a zero-point length in the spacetime. The resulting field equations remain
invariant when a constant is added to the matter Lagrangian, which is a
symmetry of the matter sector. Therefore, the cosmological constant arises as
an integration constant. A non-zero value $(\Lambda)$ of the cosmological
constant renders the amount of cosmic information $(I_c)$ accessible to an
eternal observer finite and hence is directly related to it. This relation
allows us to determine the numerical value of $(\Lambda)$ from the quantum
structure of spacetime.
