So there are virtual stops all over the city. You book a ride let's say city center to your home. The service integrates this route into existing rides or create a new ride. It might stop 5 times on the way to your home and pick up people and drop them. And you as a passenger won't know the route in advance. And it will not be the fastest to your place in most cases.
I guess this is what you call "ride sharing". It is like your parents picking you up from football and realizing the kid from the other part of the town also needs a ride so they make a huge detour
The moia service in Hamburg Germany offers virtual stops which is the next step I would argue. The bus follows a different route and stops every time based on the need of current passengers