Blood pressure refers to the force exerted by circulating blood on the walls of blood vessels. It is measured as systolic (when the heart contracts) over diastolic (when the heart relaxes) pressure. High blood pressure can damage organs over time and lead to complications like stroke, heart failure, and kidney disease. Risk factors include age, family history, obesity, sedentary lifestyle, smoking, excessive alcohol, and stress. Prevention involves weight control, reducing sodium, exercising regularly, moderating alcohol, quitting smoking, and managing stress. Treatment may include medications like diuretics, beta blockers, ACE inhibitors, and calcium channel blockers.