Creative Commons is a non-profit organization which created licenses that help you easily license your works to the specifications you want. These licenses tell users what they can do with the material they want to use. These licenses are useful for BOTH the creator AND the user (or re-user)! Creative Commons is also a place to search for content you can reuse (be sure to attribute the creator when reusing!).
As a creator you can select a Creative Commons license to place on the material you create to let users know exactly how they may use the material.
As a user you'll be able to easily see from a Creative Commons license just what you can do with the material, in terms of sharing, adapting, etc.. If there is not a license, it's best to reach out to the creator to ask how or if you can reuse the material. Creator attribution is usually the minimum expected. Learn more about attribution in the Best Practices for attribution link to the right.
Licenses on materials can appear as icons, buttons, or descriptive phrases, such as these examples:
"Dog in Snow” by John Doe is licensed under CC BY-ND 2.0.
Title should link to the source of the material (where you found it for reuse), author's name should link to their online profile (if available), and the license should link to the license deed.*
This work is licensed under CC BY-SA 4.0
*A license deed explains how you can reuse material. and can be found in the Creative Commons About the Licenses linked below.
Creative Commons licensing help chart from Foter. (CC BY-SA 3.0)