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Contraction of heart ventricles generates blood pressure. It is the hydrostatic pressure that blood exerts against he wall of a vessel. Rigid vessels maintain blood pressure; less rigid vessels deform and blood pressure is lost.
What Is It? If you subtract the smaller blood pressure number from the larger one you get a number which is the Pulse Pressure. For example, a blood pressure of 120 over 80 yields one of 40 mm Hg (120 minus 80 = 40). Obviously it is the difference between the systolic and the diastolic pressures. Let's call it PP. Thus there are three components to this (or any other) blood pressure reading: Systolic pressure (120), diastolic pressure (80) and pulse pressure (40). SBP, DBP and PP.