van der Waals (vdW) is a crucial ingredient in understanding the non-covalent interactions between molecular fragments. It originates from instantaneous and correlated quantum fluctuation of electron density electronic systems. As a result, they are ubiquitous and essential to compute with high accuracy. Being long-range part of electron correlation energy, an accurate estimation of the vdW interactions can be obtained from post-Hartree-Fock methods. These methods including coupled-cluster (CC) and configuration interaction (CI) calculations provide a systematic and accurate results. However, these methods are computationally too expensive to be used for large molecules particularly for molecular dynamics simulations. On the contrary, density functional theory-based approximations (DFTA) usually fail to describe the vdW interactions properly due to inadequate description of electron correlations. As a result, dispersion corrections are usually employed on top of DFT methods. In this paper, we aim to describe one such correction scheme which is an amalgamation of quantum oscillator based models for quantum fluctuations and fragment-based models (see for a comprehensive review).