The topic of wettabilty is extremely important from both fundamental and applied aspects. The applications of wettability range from self–cleaning windows to micro– and nanofluidics. This book represents the cumulative wisdom of a contingent of world–class (researchers engaged in the domain of wettability. In the last few years there has been tremendous interest in the "Lotus Leaf Effect" and in understanding its mechanism and how to replicate this effect for myriad applications. The topics of superhydrophobicity, omniphobicity and superhydrophilicity are of much contemporary interest and these are covered in depth in this book.