In recent years, focusing an ultrasound beam on a subwavelength scale, i.e. beyond the diffraction limit, has attracted much attention. Under this circumstances, the beam is referred to as a superfocused beam. Focusing beyond the diffraction limit may substantially improve the resolution of ultrasound imaging systems, underwater sonar, and acoustic microscopy. Also, it may further enhance particle tweezing with the acoustic radiation force. These new avenues of possibilities have motivated us to seek for a simple scheme to achieve ultrasound superfocusing. To accomplish this goal, we introduce the concept of acoustic jets through a theoretical and computational analysis, with experimental confirmation. An acoustic jet is a superfocused and highly intense ultrasound beam generated in the scattering by a solid or liquid sphere. This phenomenon occurs in the nearfield of the sphere shadow region and propagates over few wavelengths without much diffraction.