The area of the edge of a knife’s blade is extremely small. This creates pressure high enough for the blade to cut through a material.
Syringes are used to take blood for blood tests. The pressure of the liquid (blood) forces the liquid to move into the syringe when its plunger is withdrawn.
When air is sucked out of a drinking straw, the air pressure inside it decreases, and the atmospheric pressure outside forces the liquid to go inside the straw.
Skis have a large area to reduce the pressure on the snow. This ensures that the skis do not sink into the snow too far.
The pressure under the studs o the soles of football shoes is high enough for them to sink into the ground, which gives extra grip.
A vacuum cleaner has a fan inside that creates a low pressure inside the device. Consequently, air and dirt particles are sucked into the device.