Instruction:
1. Go to Google Drive
2. Find the file you would like to share publicly.
3. Right-click on the file and select "Get Link".
4. Move your mouse over the drop-down menu in the new pop-up dialog. The default option is "Restricted".
5. Click on this drop-down menu and change the option to "Anyone with the link".
6. Click on the "Copy link" button on the right side of the link/url to copy the link.
7. Now you can share this copied link with anyone (in emails, message boards, chatrooms, etc).
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For more detailed instructions read the following articles:
https://support.google.com/docs/answe...
https://support.google.com/a/users/an...
https://support.google.com/a/users/an...