I always use a plain white or black background to give maximum possible contrast with the text. You have to bear these less-than-ideal conditions in mind if you want to be sure that everybody can see and read the content of your slides. Often, though, you'll be presenting in a multi-purpose room with rows of seats at the same height, meaning most people only have a partial view. In dedicated lecture theaters with banked rows of seats, most of the audience will have an unobstructed view of the screen. It's highly unlikely that the projector you use will produce as clear an image as the one you're looking at while you're creating your slides. If you use a fairly modern laptop, the screen is probably pretty good in terms of resolution, brightness and contrast, but if you're presenting to an audience of more than about three, you won't be using your laptop screen. What you see on your screen is not what your audience will see Most people will know basic principles like, "don't put too much text on the screen", but designing good slides is a bit more complicated than that.
If done well, the PowerPoint slides you use can serve as a strong visual reinforcement to the words you speak, but doing them well is very difficult. Whether it's a major international conference, a small group meeting or a thesis defence, presentations are an essential part your work.
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