Wetting is the ability of a liquid to maintain contact with a solid surface, resulting from intermolecular interactions when the two are brought together. The degree of wetting (wettability) is determined by a force balance between adhesive and cohesive forces.
Wetting is important in the bonding or adherence of two materials. Wetting and the surface forces that control wetting are also responsible for other related effects, including so-called capillary effects. Regardless of the amount of wetting, the shape of a liquid drop on a rigid surface is roughly a truncated sphere. Various degrees of wetting are summarized in this article.
Read more about Wetting: Explanation, High-energy Vs. Low-energy Surfaces, Ideal Solid Surfaces, Non-ideal Rough Solid Surfaces, Spreading Dynamics, Effect of Surfactants On Wetting