Why is "world" in a phrase "the world's most beautiful flower" followed by apostrophe and s? What about "the world most beautiful flower"? Any significances?

Thank you in advance.

Question

Why is "world" in a phrase "the world's most beautiful flower" followed by apostrophe and s? What about "the world most beautiful flower"? Any significances?

Thank you in advance.

Answer

'The world most beautiful flowers' has no meaning. The apostrophe and s ('s) is there to indicate possession or belonging. They are the most beautiful flowers of the world (belonging to the world).