The presence of defects and heterogeneities in different surfaces generates that a propagating fluid front (fluid-air interface) gets attached to the surface in a phenomenon known as pinning. The pinning and depinning mechanism of a fluid-air phase boundary in porous and heterogeneous media plays a critical role in determining adhesion, crack propagation, oil recovery, drop formation, evaporation, and leakage; and the development of superhydrophobic and slippery liquid-infused porous surfaces.