This image shows a roof-to-wall area at the gutters which is missing a kickout flashing. The vinyl siding is installed onto the vertical wall completely covering the wall flashing. The problem with this is water is being forced behind the vinyl. This can lead to wood/truss damage or mold issues.
This picture of a kickout flashing is a “purchased” type. It includes a built in splash guard as well. Regardless of the style you can see how the kickout is behind the lowest portion of the wall flashing. This forces water in front of the kickout and into the gutters.