A Resonite World is like a level or a map. A world is made up of a single Slot -- the Root slot -- and metadata, like the name and owner of the world.
There is also hidden neighboring slots and configuration files next to the root slot, but this is not normally seen to a regular user without a mod or using Ref Hacking.
Creating A World
Users can create new worlds from the Dash Menu. When saved, a world appears in the inventory as a World Orb. This can be spawned and interacted with to create a new Session running the world.
However, this World Orb is just a link to the world; the world itself is stored in the "My Worlds" category of the world's creator.
Publishing A World
Worlds can be published using the World Publisher. To learn more, see Submitting Worlds
Other Features
Users can use a technique called Grab Smuggling, a way to transfer items across worlds.
Recovery Of Assets
When a world crashes and throws and exception, the world gets dumped to a log file, which contains the assets from that world. In the event this happens, you can recover your items and assets by going to that log file and getting the .brson entries to then paste/import them into a new world for you to save them.