Back splash normaly attached together with the counter top, it raises roughly around 50mm to 80mm at the back of ure kitchen counter top. Normaly the mateirals that ppl use is solid surface, such as LG max or Corian, or some ppl prefer to use granite for kitchen counter top + backsplash.
The one that covers the wall isn't a back spalsh, those are just backing. And there are plenty options on materials tat can be used. Stainless steel, tiles, wall paint, or like that picture shown above. The material is coloured back glass. It will make ure entire kitchen wall looks elegant if u use the correct colours of coz. =)
Tempered coloured glass is quite durable for backing (normally ppl use it for the aesthetic pleasure). However, when it comes to hobs and heavy cooking, maybe try consider using another material such as stainless steel.
Some ppl mix both materials, those that are align with the hob = use stainless steel,
and the rest of the wall area = coloured back glass.
Hope it helps:)
Regards