It basically means depending on what your meaning. it could mean in the world of the world or the world.
Pain du monde
oiseaux du monde: birds of the world;la plus belle fille du monde: the most beautiful girl in the world;il y a du monde qui arrive: there are (some) people coming.
world cup
School of the world.
Pain du monde
Il y a du monde means 'there are loads of people'. And is you hear 'il y a du monde au balcon', this is a slang/familiar observation that some girl has big breasts.
Artisans du Monde was created in 1974.
Café du Monde was created in 1862.
Entrepreneurs du Monde's population is 10.
Entrepreneurs du Monde was created in 1998.
L'Origine du monde was created in 1866.
Médecins du Monde was created in 1980.