SMPS & UPS...Whats the Difference ??

SMPS (switch mode power supply)
IS USED TO CONVERT UR 220V OR 110V TO LOWER LEVEL RQUREID BY ELECTRONICS (5V AND 12V).
SMPS IS BUILT INTO COMPUTER CASE.
WHILE
UPS (Uninterupted Power Supply)
IS USED TO PROVIDE POWER TO UR COMPUTER EVEN IF THE MAIN POWER IS GONE.
BUT UPS ONLY PROVIDE LIMITED POWER THAT ,,MEANS DEPENDS ON WHICH UPS U USED.
SOME CAN PROVIDE POWER FOR 10 MINUTES SOME CAN EVEN FOR 24 HOURS.
BUT COST ALSO INCREASE .
UPS HAS TO BE PURCHASE SEPRATELY.