So, it can be one of two general throws.
1). Think a wheel route type fade or man over 20-30 yrs fade pattern that are covered well or a goal line back shoulder fade. A QB will see tight coverage and throw the ball more on a line purposely short and to the outside back shoulder on the deeper route. A key though is for the receiver to keep running fast and make a sharp stop so the defender either runs past or into the receiver. The goal like back shoulder is about 2 yards into the end zone on a dart towards the receivers back hip area. Again, the receivers detail is just as important as the throw. Can’t turn too early.
2) A cover three deep 50 yard single coverage bomb is generally trying to hit the guy in stride but if it’s covered well and short, the receiver is the one who again makes the play happen by running hard until the very last moment and stopping if possible on the route vs just gradually slowing down because that’s easier for the defender to defend. But those throws are a lot of times just seeing one on one coverage and saying my guy is better than yours and you don’t really over throw it for that reason.