Blood travels through blood vessels much like water through a garden hose. The blood in the vessels is under pressure just like the water in a hose when the tap is turned on.
With each heartbeat more blood is pumped into the vessels - like turning up the tap - so the pressure rises. This is the systolic blood pressure, the first number in the blood pressure measurement, which is normally around 120.
Between heartbeats, while the heart is resting, the pressure in the arteries is lower. This is the diastolic pressure, second number in the blood pressure measurement, which is normally around 80.
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