Following are the main design features of the suspension dampening component classified as a Vw strut (not a Vw shock absorber). A Vw strut (a.k.a. MacPherson strut) contains a shock absorber and has been designed to perform multiple suspension functions.
On Vw models a struts primary function is to act as a shock absorber, dampening the impacts of road irregularities. Vw struts also carry the coil spring on which the vehicles body is supported. The upper portion of a Vw strut usually has a built in steering arm that a steering tie rod attaches to. The strut assembly also pivots, controlling the steering of the wheels. The design of a Vw strut eliminates the need for an upper control arm. However, it always needs to be supported with a lower control arm. Another unique design feature of some Vw struts (depending on model) is a replacable internal shock absorber cartridge. This cartridge is mounted inside the strut and can be replaced when it is worn out.
The strut assembly plays a major part in supporting the vehicle and is a major member of the suspension system. On the other hand a Vw shock absorber doesn't do any of the above with one exception. On rear Vw suspension systems the shock absorber is used in conjunction with a coil spring to support the rear of the vehicle. Otherwise the primary function of the shock absorber is just for dampening.
From 1978-2009 most Vw models front suspensions were equipped using a strut assembly design. With the exeption of the newer Vw Passat, which was introduced in 1998 and began using a very complex 8 piece control arm front suspension design utilizing just a shock absorber for dampening. This complex 8 piece control arm and shock absorber design is still being used on the larger platform Vw Passat, Audi A4, A6, A8 models. Vw discontinued the 8 piece control arm design around 2006. With the exception of the Phaeton and Toureg models which still use shock absorbers all other Vw models, Jetta, Golf, Rabbit, EOS and Beetle utilize strut assemblies. The popular Vw Eos models use a strut system.