The F20/F21 is the second generation of the 1 Series, which was released in 2011.
The body styles of the F20/F21 range are a 3-door hatchback (model code F21) and a 5-door hatchback (model code F20).
For the second generation of 1 Series, the coupe and convertible models were spun off to create the BMW 2 Series range.
The F20/F21 was initially powered by four-cylinder petrol, four-cylinder diesel and six-cylinder petrol engines. In 2015, three-cylinder petrol and diesel engines were added to the model range. All engines are turbocharged.
Unlike most hatchback competitors, the F20/F21 uses a longitudinally-mounted engine and rear-wheel drive (instead of front-wheel drive) for most models. The F20/F21 is the first 1 Series to offer an optional all-wheel drive (called "xDrive" by BMW).