Overworld

The Overworld is the dimension where players spawn for the first time. Most bases are located in the overworld since in the Nether it is impossible to place a bed and the End is a less-popular opposite dimension.

Transportation
The overworld isn't frequently used for long-range transportation since the nether is a much-preferred alternative, being that one block in the nether is equivalent to 8 in the Overworld.

Resources
The overworld is the major area of resources. Nearly all resources can be found in the overworld, usually in bulk amounts since they're plentiful and usually unlimited.