Suction is the process of creating a vacuum or low-pressure area that draws in surrounding air or liquid. This occurs when a force, such as a pump or a person's mouth, removes air from a space, causing the pressure inside to drop. As a result, the higher pressure outside pushes substances into the lower pressure area. Common examples of suction include using a straw to drink a beverage or a vacuum cleaner to pick up dirt. In both cases, the difference in pressure allows the liquid or debris to be pulled into the lower pressure zone, demonstrating the principle of suction in action.