Switching voltage regulators, what is regulator, switching regulator circuit

MP2451 Series 36 V 0.6 A 2 MHz Surface Mount Step-Down Converter – SOT-23-6 Website URL: https://www.futureelectronics.com/p/semiconductors–analog–regulators-reference–switching-regulators/mp2451dt-lf-z-monolithic-power-systems-2045646 Country List: Bangladesh