The Jaguar XK series (XK, XK8 and XKR) is a series of grand tourer cars produced by British car maker Jaguar since 1996. The series was introduced at the Geneva Motor Show on 5 March 1996. The first generation of the series, the XK8, replaced the XJS, and was available as a coupé and convertible. The XK8 was the first 8-cylinder vehicle produced by Jaguar, when the Jaguar AJ-V8 engine was introduced.

The second generation XK was launched in 2006. The new XK introduced an aluminium monocoque bodyshell, and is available both as a two-door coupé and two-door cabriolet/convertible, with just the engine and associated mechanicals being carried forward.The XK8 was launched in 1996 to replace the XJ-S. Two body styles were produced - a coupé and a convertible. The car was the first in the Jaguar line-up to use Jaguar's newly developed V8 engine - the AJ-V8. In 1998 the supercharged XKR was added to the range.The completely new Ian Callum designed XK was unveiled in 2005 Frankfurt Motor Show. Ian claims that the inspiration for the shape of the new XK came from his admiration for British actress Kate Winslet's curves.[1] The XKR has an unlimited top speed of 174 mph, the standard XK has an unlimited top speed of 158 mph. The faster XKR-S model was added in 2012. The XKR-S gained an additional 40 horsepower over the XKR which brought the 0-60 mph time down to only 4.4 seconds and the top speed up to 300 km/h. A convertible version of the XKR-S has also been released.[2]The Jaguar XK (project code X150) is the second generation of the Jaguar XK grand tourer from Jaguar Cars. The vehicle was unveiled in 2005 at the Frankfurt Motor Show with the first generation's 4.2-litre V8 engine. The XK convertible was unveiled in 2006 North American International Auto Show in Detroit. A facelifted XK was launched in 2009 with a new 5.0-litre V8.The X150 design was based on Advanced Lightweight Coupé (ALC) which was first seen at the 2005 North American International Auto Show. The designer, Ian Callum, was also responsible for the Aston Martin DB7 and Vanquish coupés. The new XK's grille is inspired by that of the 1961 Jaguar E-Type.The XK received a facelift in 2009,[1] with minor alterations to front and rear lighting and bumper designs, together with the introduction of a new 5.0 L V8 for both the naturally aspirated XK and the supercharged XKR. The interior also received some changes, in particular the introduction of the XF style rotary gear selector mated to the new ZF automatic transmission.

The range was extended in 2011, with the introduction of the new XKR-S at the Geneva Motor Show, featuring an upgraded XKR engine producing 550 PS (405 kW; 542 hp)[2] and torque of 680 N·m (502 lb·ft). The XKR-S badge was first used on the 2008 special edition XK. Jaguar claimed that this new version is the fastest production Jaguar ever, a top speed of 186 mph (299 km/h) and acceleration from 0 to 60 mph (97 km/h) in 4.2 seconds (0–100 km/h (62 mph) in 4.4 seconds).

The XK received a second facelift in 2011 with new front bumper and light design[3] which was presented at the New York Auto Show.