The new sharing interface of Google Drive shows you an option to share explicitly with certain people. If you are looking to share with a wider audience, click on “Get shareable link.”

Magical

Clicking on the link automatically switches the sharing settings to anyone with the link can view. This is great news for students and teachers who are less practiced with using Google Docs.

Copy Link

The link is automatically copied to the clipboard. The only next step is to select done.