What is the key difference between a give way sign and a stop sign when you approach an intersection?

1. A give way sign is only used at T-intersections; a stop sign is used at crossroads
2. At a give way sign you slow down and stop only if necessary; at a stop sign you must always come to a complete stop
3. A stop sign means give way to vehicles on the right only; a give way sign means give way to all vehicles
4. There is no practical difference — both require a full stop