Difference between SMPS and UPS

1. Switched Mode Power Supply (SMPS) : It is used to change from a specific DC voltage to another DC voltage level usually it reduces the supply voltage to a lower level so that it can be used by components requiring lower voltage. 2. Uninterruptible Power Supply (UPS) : It is used to supply power to devices for a fixed amount of time without stopping even when there is no incoming power supply. 
Difference between S.M.P.S and U.P.S :

Parameter	UPS	SMPS
Power Conversion	Provides A.C supply when power fails.	Converts A.C to D.C power.
Transformers Used	Low-frequency transformers used.	High-frequency transformers used.
Backup	UPS have backup capabilities.	SMPS don’t have any kind of backup capability.
Power Storage	Power storage equipment is used to store the incoming supply.	No power storage equipment used.
Pricing	It is usually costlier than SMPS.	Prices are usually lower than UPS.
Placement	Usually outside the cabinet.	Inside the cabinet.
Size	Usually, the size is slightly bigger than SMPS.	Usually, Smaller than UPS.
Electronic Components	Rectifier, UPS Batteries, Inverter, Static Bypass Switch.	PWM Oscillator, HF rectifier, MOSFET switch.
Popular Manufactures	Schneider, Luminous, Su-Kam, Genus Power.	Marc Computers, Thermaltake, Zebronics.