
several superheroes in the DC Comics universe
I don't have sufficient context to write an accurate overview. You've indicated that Flash refers to "several superheroes in the DC Comics universe," but this alone doesn't provide the specific details needed to explain what Flash is or why it matters in a meaningful way. I would need more information about the character(s), their abilities, or their significance to write a proper overview.
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via Wikipedia infobox
The Flash is the name of several superheroes appearing in American comic books published by DC Comics. Created by writer Gardner Fox and artist Harry Lampert, the original Flash first appeared in Flash Comics #1 (cover-dated January 1940, released November 1939). Nicknamed "the Scarlet Speedster", all incarnations of the Flash possess "superspeed", which includes the ability to run, move, and think extremely fast, use superhuman reflexes, and seemingly violate certain laws of physics.
Thus far, at least five different characters –each of whom somehow gained the power of "the Speed Force"– have assumed the mantle of the Flash in DC's history: college athlete Jay Garrick (1940–1951, 1961–2011, 2017–present), forensic scientist Barry Allen (1956–1985, 2008–present), Barry's nephew Wally West (1986–2011, 2016–present), Barry's grandson Bart Allen (2006–2007), and Chinese-American Avery Ho (2017–present). Each incarnation of the Flash has been a key member of at least one of DC's premier teams: the Justice Society of America, the Justice League, and the Teen Titans.
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