Explain to me please: ''a magnetised screwdriver can help screws in holes that are hard to reach'' please!

explain to me please: ''a magnetised screwdriver can help screws in holes that are hard to reach'' please!
When you work in spots that you can not fit both your hands, one on the screwdriver the other on the screw, it does help, you can make a screwdriver magnetic by rubbing it on a magnet a few times, the only problem I have with this is you have one shot to line it up, if you miss the hole or slip you have to put the screw back on and try again. A trick I tried while I was in the service was to take a piece of tape and poke your screw through it and then wrap it around you screwdriver once your screw is in place just pull the tool and the tape follows.