It is quite easy to share a Google Presentation(is it Google Presentation or Google Slides?) using the blue share button, but what if you wanted to just share a link to the actual presentation that you can have auto play or reset after the last slide. It's quite easy.  
  1. Under File, choose Publish to the web
  2. Select your options
  3. Click the blue Publish button
  4. Copy the link provided or share however you would like using the providers below the link
Publishing the link this way allows you to take away viewership of your presentation at any time or keep others from making a copy of your content.