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Diastolic blood pressure measures the pressure in your blood vessels between heartbeats, when your heart is resting. It is represented by the bottom number in a blood pressure reading. Systolic blood pressure measures the amount of pressure that blood exerts on vessels while the heart is beating.
The first reading, the systolic pressure, measures the pressure when the heart is pumping blood to the body through the arteries. The second reading, the diastolic pressure, measures the pressure within the arteries when the heart is receiving blood returning from the body. There needs to be an underlying pressure within arterial blood vessels regardless of whether the heart is pumping or not.