Currently the world's hottest chile pepper, a hybrid of 2 former world record holders, the bhut jolokia and the Red Savina habañero. Although there is some recent debate as to whether it is genetically distinct from the Trinidad 7 Pot Primo strain, another hybrid species which is very similar in heat level and appearance.
Typically superhots have chemical undertones, as if you can actually taste the capsaicin. However, the Carolina Reaper has a sweet and fruity flavour, with hints of chocolate and cherry, right before the heat kicks in.