Find the Terraria world file on your PC
Open File Explorer
Go to `DocumentsMy GamesTerrariaWorlds`
Locate the world files with `.wld` and `.twld` extensions
Copy the world files
Send the copied files to the other person
Use email, Discord, Google Drive, OneDrive, Dropbox, or a USB drive
Have the other person place the files in their own `DocumentsMy GamesTerrariaWorlds` folder
Make sure both `.wld` and `.twld` files are included
If they do not have a `.twld` file, the `.wld` file alone may still work
Open Terraria and check the world list
If the world does not appear, restart Terraria
If needed, zip the files before sending them