Theory of Almost-Periodic Functions -- Almost-Periodic Functions in Banach Spaces -- Harmonic Analysis of Almost-Periodic Functions -- Weakly Almost-Periodic Functions -- The Integration of Almost-Periodic Functions -- Applications to Almost-Periodic Functional Equations -- The Wave Equation -- The Schrödinger Type Equation -- The Wave Equation with Nonlinear Dissipative Term -- Results Regarding other Functional Equations.