What is a switching regulator, switching power regulator, Step-Down Switcher

 Switching Voltage Regulators 5.5V, 4A, 1.2Mhz Step-Down Switcher

https://www.futureelectronics.com/p/semiconductors--analog--regulators-reference--switching-regulators/mp2147gd-p-monolithic-power-systems-6132186