Acoustics is the branch of physics concerned with the study of mechanical waves in solids, liquids, and gases. It covers topics such as ultrasound, vibration, sound and infrasound. Acoustics are applied for ensuring the proper transmission of sound. Ultrasonics refers to the study of sound waves or vibrations with frequencies greater than the human audible range. These ultrasound waves are commonly used by species such as bats and whales, which can communicate and navigate using ultrasounds. Ultrasonics can be utilized to develop techniques for measuring the location of internal organs and studying their functions. It is also used for ranging and navigating, and nondestructive testing of materials. This book elucidates the concepts and innovative models around prospective developments with respect to acoustics and ultrasonics. It presents researches and studies performed by experts across the globe. This book, with its detailed analyses and data, will prove immensely beneficial to professionals and students involved in this area at various levels.