Fluid mechanics deals with the behavior of fluids at rest and in motion. It can be divided into three divisions: hydrostatics, kinematics, and dynamics. Hydrostatics studies fluids at rest, kinematics deals with fluid motion without forces, and dynamics relates velocities, accelerations, and forces acting on fluids. Fluids include liquids and gases, with gases being readily compressible and liquids being nearly incompressible. Fluid mechanics has many applications in daily life and engineering.