"All over the world" means in many places across the globe, not limited to one area. It describes something widespread or found in multiple countries and cultures. People use it to stress broad reach, global presence, or international scope.
Silver and gold are not the only coin; virtue too passes current all over the world. Euripides
Classical quotation is the parole of literary men all over the world. Samuel Johnson
If I lose the light of the sun, I will write by candlelight, moonlight, no light. If I lose paper and ink, I will write in blood on forgotten walls. I will write always. I will capture nights all over the world and bring them to you. Henry Rollins
Black women all over the world should re-unite and re-examine the way history has portrayed us. Buchi Emecheta
People are all over the world telling their one dramatic story and how their life has turned into getting over this one event. Now their lives are more about the past than their future. Chuck Palahniuk
Movies are something people see all over the world because there is a certain need for it. Wim Wenders