Handouts are documents you can print from within PowerPoint that include slide representations from your presentation — you can opt to include as many as 9 slides on each handout page, and then the slides look more like thumbnails. Of course, you can also choose to print just one slide on every handout page — then your handouts will look like individual slides printed on a page. Most handouts are created to be printed — and the look and feel of these printed handouts is determined by the Handout Master. To access and make edits to the Handout Master, you need to get to the Handout Master view in PowerPoint 2010 — changes you make in this view influence the look and layout of printed handouts. You can change or edit the background, the header, and the footer of printed handouts.
Learn about the Handout Master view in PowerPoint 2010 for Windows.

