It’s quite simple, really! A stroller that is also a jogger will have three wheels, instead of four. This makes it more dynamic, and much easier to maneuver around various types of terrain, and potential obstacles that you’ll come across either in the city, parks, or wherever else you may be.
Jogging strollers are going to give a much smoother ride, and will often have safety features such as a padded 5-point harness made for keeping them held in at higher speeds.