This book provides an updated overview on different topics related to the fundamentals and applications of drops and bubbles and to their interaction with a solid surface. Not only theoretical and experimental contributions are covered, but also a wide range of fields with the common background of wetting and wettability, liquid-solid interfacial properties, spreading dynamics. An interesting peculiarity arises from considering several types of liquids: pure liquids, surfactant solutions, ionic liquids, liquid metals. Therefore, the book is useful both to readers willing to deepen their knowledge on specific topics as well as to those seeking a general overview on the subject. In addition, the book can be widely used for materials, physics and chemistry courses for undergraduates.