This document discusses the concept of pressure and provides examples. Pressure is defined as force per unit area, with the standard SI unit being the pascal (Pa). Higher pressures are caused by large forces applied over small areas, while lower pressures result from smaller forces applied over large areas. Examples are given of applications requiring high pressure, like nails, and low pressure, like caterpillar tracks. The document also provides a formula for calculating pressure and works through examples of determining pressure exerted by human feet on the ground.