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From Wikipedia:

Once nicknamed the Scarlet Speedster, all incarnations of the Flash possess "super-speed", which includes the ability to run and move extremely fast, use superhuman reflexes and seemingly violate certain laws of physics. Thus far, four different characters, each of whom somehow gained the power of "super-speed", have assumed the identity of the Flash: Jay Garrick (1940-), Barry Allen (1956-1985, 2008-), Wally West (1986-2006, 2007-), and Bart Allen (2006-2007). Before Wally and Bart's ascension to the mantle of the Flash, they were both Flash proteges under the same name: Kid Flash.
The second incarnation of the Flash, Barry Allen, is generally considered the first hero of the Silver Age of comic books and the superhero has remained one of DC‘s most popular ever since. Each version of the Flash has been a key member of at least one of DC's three premier teams: the Justice Society of America, the Justice League, and the Teen Titans. Wally West has recently rejoined the Justice League, and Barry Allen recently returned to life in the pages of Final Crisis.
The Barry Allen version of the character (with Wally West elements) was featured in a live action television series in 1990.