>>714131140Ambient occlusion. It's the subtle shading you get on surfaces based on their angle and distance from one another, meant to emulate how certain grooves and surfaces are occluded from ambient light. It actually looks really good, has been a crucial part of graphics since Crysis and does not belong on that list.
However, the example in OP's pic is particularly bad and there are a few games like that. In OP's example it's just drawing a black halo around the entire object. What it should be doing and usually does is draw AO only on proximate edges, i.e. between the tyre and the ground, not between the roof of the truck and the ground several feet behind it.