1. Do an Internet search (examples below are from a Google and Bing search)
2. Click "Images"
3. Click "Tools" or "Filter" (depending on the search engine you're using)
4. Click "Usage Rights" or "License"
5. Click "Creative Commons licenses" or "Free to use.." or one of the other choices on Bing
Now you can select an image and use it freely.
Did you find an image but you're not sure where it came from? Do a reverse image search.
You can also do an image search, right click on any image, and choose the option to search the internet for that image.
If you use images, such as photographs or clipart, in your presentation, you should also credit the source of the image. Do not reproduce images without permission. See the box "Creative Commons and Royalty-Free Images" in this guide to find sources for images that are "public use".
Use the acronym TASL to remember how to attribute images:
T - Title/Description
A - Author or creator
S - Source & date (Name of the website the image is from)
L - License or location (Creative Commons license or URL)
For example...
"Satellites See Unprecedented Greenland Ice Sheet Surface Melt" by NASA Goddard Space Flight Center is licensed under CC by 2.0
Title: Satellites See Unprecedented Greenland Ice Sheet Surface Melt
Author: NASA Goddard Space Flight Center
Source: Flickr (linked in title)
License: CC by 2.0