The Mercedes-Benz S-Class is a series of the largest sedans produced by Mercedes-Benz, a division of Daimler AG. The classification was officially introduced in 1972 with the W116 S-Class, which succeeded previous Mercedes-Benz models dating to the mid-1950s. As the flagship of the Mercedes-Benz lineup, the S-Class has debuted many of the company's latest innovations, including drivetrain technologies, interior features, and safety systems. The S-Class has ranked as the world's best-selling luxury flagship sedan, and its latest generation, the W221 S-Class, premiered in 2006 as an all-new design. As in previous iterations, the W221 S-Class is sold in standard and long wheelbase versions; V6, V8, V12, diesel and hybrid powertrains are offered., , The name "S-Class" derives from the German word "Sonderklasse" of which "S-Class" is an abbreviation. Sonderklasse means "special class" and in automotive terms thus refers to "a specially outfitted car." Although used colloquially for decades, following its official application in 1972, five generations of officially-named S-Class sedans have been produced. Past two-door coupe models of the S-Class were known as SEC and later S-Coupe. In 1998 they were spun off in a separate line as the CL-Class, however it will be re-designated as the S-Coupe for the 2011 model year., , In late 1999, the W220 was introduced. The W220 S-Class was completely restyled, with a body that was slightly smaller and lighter than its predecessor. Unlike its predecessor, the W220 was not the first model to feature the company's new design theme for the next generation of Mercedes-Benz. This honor was given to the A-Class when it launched in 1997. The new S-Class incorporated the new styling cues first introduced on the Mk I A-Class the year before (for example, the dashboard carried over the new styling details first seen in the A-Class), with a renewed focus on elegance and style in a more rounded shape compared to the preceding W140. Despite being smaller, the W220 S-Class offered more interior space than the W140., , As with each new S-Class, the W220 brought in new innovations such as Airmatic air suspension and Active Ventilated Seats A navigation system with center console-mounted screen display was introduced, along with the COMAND input control system. Other options included keyless entry and ignition, a radar-controlled Distronic cruise control system and a cylinder shut-off system called Active Cylinder Control.