Wikipedia
C-segment (or medium cars) is a car classification defined by the European Commission as the third smallest segment (above the A-segment and B-segment) in the European market. As the "segment" terminology became more common in the United States, in 2012 the New York Times described the differences, saying "today's small cars actually span three main segments in the global vehicle market. The tiny A-segment cars include the Chevy Spark and Smart Fortwo. They're extremely short and very light. Slightly larger are B-segment cars like the Ford Fiesta and Chevy Sonic. The A- and B-cars are known as subcompacts. In the C-segment — typically called compacts — are the largest of the small cars. Examples include the Toyota Corolla, a perennial sales leader, as well as the Ford Focus, Citroën C4 and DS4, Chevrolet Cruze, Honda Civic, Hyundai Elantra, Mazda 3, Nissan Sentra, Peugeot 308, 408, Renault Mégane, Fluence, BMW 1 Series, Tata Manza, Fiat Tipo, Volkswagen Golf, Jetta and Alfa Romeo Giulietta"