If it's on the internet, I can use it, right?
Well, not exactly. There are some rules that allow us to use others' work in our own, and those rules only work in some situations.
That's stupid.
You might not understand it yet, but you are all going to be creators and contributors of internet content (some of you already are). The first time you see your work on someone else's feed or site without permission or credit, you'll understand.
Whenever possible, use only images that:
You have gotten permission to use from the creator or owner, -or-
Have permission to use built into the license.
Use these resources to find images with built-in permission to reuse in your work:
Google Images (with license filter) - after searching, click Tools > Usage Rights > “Labeled for noncommercial reuse”
You will still need to provide a citation or attribution for images, unless your source specifically states that no attribution is required. This is true even if you have permission (granted or built-in) to use them.
Find more copyright-friendly resources here.
Creative Commons is an organization that allows creators of online content to assign permissions and restrictions for how their work is used. Creative Commons works with online platforms, like YouTube, Flickr, Wikipedia, and Vimeo, to make sure that published content is shared responsibly.
You may use most material that is licensed by Creative Commons in your work as long as you include an attribution. An attribution is similar to a citation, but is less formal. Here are some examples of attributions you might include:
“Dog in a party hat” by pcag from Flickr -or- “Spider eats snake” by oh-nope licensed under Creative Commons
You can search for images at creativecommons.org/use-remix to find licensed images on other sites, including those listed above.