Creative Commons helps you legally share your knowledge and creativity to build a more equitable, accessible, and innovative world.
One goal of Creative Commons is to increase the amount of openly licensed creativity in “the commons” — the body of work freely available for legal use, sharing, repurposing, and remixing. Through the use of CC licenses, millions of people around the world have made their photos, videos, writing, music, and other creative content available for any member of the public to use.
Here is a photo.
This is an ideal attribution
“Creative Commons 10th Birthday Celebration San Francisco” by tvol is licensed under CC BY 2.0
How you attribute authors of the CC works will depend on whether you modify the content, if you create a derivative, if there are multiple sources, etc. Find out more about attribution on the CC Wiki.