Final answer:
Diuretics are compounds that increase urine output and decrease water conservation in the body. They are used to treat various cardiovascular conditions and fluid retention. Alcohol and caffeine can also act as diuretics.
Step-by-step explanation:
A diuretic is a compound that increases urine output and therefore decreases water conservation by the body. Diuretics are used to treat hypertension, congestive heart failure, and fluid retention associated with menstruation. Alcohol acts as a diuretic by inhibiting the release of ADH.