What is a throttle body for a 2001 jaguar s-type car?

A throttle body on the jaguar s type is a full electronic controlled air valve. this valve controlls the amount of air delivered to the engine. on older cars this is usually attached directly to the accelerator pedal but in the jaguars case this is controlled independently by the engine computer. it does this to incorporate cruise controll,traction controll and controlls the speed the throttle opens to limit emisions. notoriously unreliable always expensive and unfortunatly indespenceable.