One of the most common misconceptions that people have about using images online is that you can use whatever image you find when you search. That is simply not true. All images are copyrighted the minute they are created. They are owned by the photographer or artist. In many cases, images that end up online are used by people without permission from the owner of the image. This is a common practice that is, in fact, illegal. So, what can you do if you are putting together that killer presentation and you find the greatest image ever, but it’s not yours? You could reach out directly to the person who owns the image to ask for permission, although that could be difficult depending on where the image came from. However, there are ways to find images where the creators have already given permission for various kinds of use (so long as you give attribution to the creator.) These images are licensed under Creative Commons. There is a special page on their site for media searches or you can do a Google Image search and then use the search tools to limit your results by usage rights. Regardless of the method, it’s much better to find images that you can legally use.
Special thanks to Judy Van Alstyne for her mad proofing skills!