Fluid pressure is the force exerted by a fluid per unit area. It occurs in liquids and gases and increases with depth due to the weight of the fluid above. For example, when you dive deeper into a pool, the pressure on your body increases because of the water above you. The formula for calculating fluid pressure is P = F/A, where P is pressure, F is the force applied, and A is the area over which the force is distributed. This principle is essential in various applications, including hydraulics, where pressure is used to lift heavy objects.