Systolic higher pressure is the pressure in the arteries when heart contracts to pump blood to the body. Diastolic lower is pressure when heart relaxes between beats. Pulse pressure refers to difference between the maximum and minimum pressures recorded.

Approximately 120mmHg systolic and 80mmHg diastolic is optimal blood pressure for adults. Hypertension means blood pressure being abnormally high and hypotension is abnormally low pressure.   More detail...