DC Comics revolutionized the speedster type of hero and villain. A speedster is basically what it sounds like — a person with a superpower that allows them to move at high speeds. Sometimes, this means they can fly really fast, but it mostly refers to those who can run very fast. DC created the granddaddy of all speedsters in the Golden Age: the Flash. During an experiment with hard water, college student Jay Garrick gained the power to run at superspeed. Garrick would start a legacy that would run through the ages.
Source：https://www.cbr.com/whos-stronger-flash-or-reverse-flash/
