When I select vertices blender selects the vertices connecting the desired vertices as well. I also notices it states: "Pick shortest path" in the bottem left. I'm quite new to blender and haven't found anything online about this. I hope you guys can help me out.
By default, Blender's behavior will pick the shortest path (eg. everything between point "A" THRU "Z") if you hold the Ctrl key on your next selection.
If you use Shift instead, then it will just append the selected item to the set of items selected (eg. Just point "A" & "Z").