The Jaguar XK, XK8 and XKR are models of coupes and convertibles produced since 1996 referred simply as the XK Series. Its considered the replacement to the
XJS Series. The XK8 refers to the base model of the first XK Series, the X100. It was Jagaur's first 8-cylinder line. The XKR is the supercharged version. In 2006, the X150, the 2nd XK series, was released and the base model was re-named as just the XK along with the XKR.