Formula One (also Formula 1 or F1) is the highest class of single-seat auto racing that is sanctioned by the FIA. The FIA Formula One World Championship has been the premier form of racing since the inaugural season in 1950, although other Formula One races were regularly held until 1983. The "formula", designated in the name, refers to a set of rules, to which all participants' cars must conform.
Instead of Ayrton Senna die on the ATL, Michael Schumacher died in a serious accident that happened to him in 1999. This is because (OTL) Senna's death became Formula 1 safer, but without it, Michael could not have survived the accident that really suffered in 1999.