The Santoku knife (which translates to "three virtues") is a widely-used multi-purpose knife, used to cut vegetables, meat, and fish. This knife type is generally flatter and shorter than the gyuto knife, with a less sharply-pointed tip.
Typically ranging in size from 165mm to 180mm in length, it's small size and flat edge allow for easier maneuverability and require less space for cutting. Due to its usability, a santoku knife is commonplace in many Japanese kitchens.