Doesn't a single speed speak for itself? I mean, why does a single speed have to have a front and rear brake? I thought single speed was a bike with one speed and a freewheel vs fixed gear being a bike with a coaster brake.

A fixed-gear bicycle (or fixed wheel bicycle) is a bicycle that has no freewheel, meaning it cannot coast — the pedals are always in motion when the bicycle is moving.

A single-speed bicycle is a type of bicycle with a single gear ratio. These bicycles are without derailleur gears, hub gearing or other methods for varying the gear ratio of the bicycle.