Why hide a slide? 

Slide show presentations can be used over and over again, with minor edits to customize as needed.  There may be times when a slide is not necessary or appropriate for a particular presentation, but you don’t want to delete the slide as you may need it for a future presentation. Hiding selected slides temporarily suppresses the slide during the presentation, skipping over it to the next.  But don’t worry, you can still see the slide while editing the presentation, and it’s easy to turn on/off.  To hide a slide: 

1. Right-click on the slide to be hidden > Hide Slide.
2. To Unhide: right-click > Hide Slide. (It’s an on/off switch).

 In PowerPoint 2007, there is also a Hide Slide button on the Slide Show ribbon. When a slide is set to hidden: 

1. The slide is still visible in the Slide Sorter and Normal views.
2. The slide number has a slash through it.
3. The slide will not come in to view during a presentation.

 If you don’t want the hidden slides to print, make sure to remove the checkmark on Print Hidden Slides from the Options button in Print Preview.