Pascal's Principle, formulated by the French mathematician Blaise Pascal, states that when pressure is applied to a confined fluid, the pressure change is transmitted equally in all directions throughout the fluid. This means that any increase in pressure at one point in the fluid will result in an equal increase in pressure at every other point. This principle is the foundation for many hydraulic systems, such as hydraulic lifts and brakes. In these systems, a small force applied to a small area can create a much larger force over a larger area, allowing for efficient movement and control of heavy objects.