Creative Commons is a U.S.-based non-profit copyright license distributor. It allows people to legally use and share the creative work of others free of charge. Copyright owners choose the level of rights they reserve and which rights they waive. In addition, Creative Commons works with content creators to facilitate the sharing of content with a wide audience by making the content more discoverable.
Copyright holders and content creators can choose from a range of licensing conditions. The below descriptions and content is from the Creative Commons website.
All CC licenses require that others who use your work in any way must give you credit the way you request, but not in a way that suggests you endorse them or their use. If they want to use your work without giving you credit or for endorsement purposes, they must get your permission first.
You let others copy, distribute, display, perform, and modify your work, as long as they distribute any modified work on the same terms. If they want to distribute modified works under other terms, they must get your permission first.
You let others copy, distribute, display, perform, and (unless you have chosen NoDerivatives) modify and use your work for any purpose other than commercially unless they get your permission first.
You let others copy, distribute, display and perform only original copies of your work. If they want to modify your work, they must get your permission first.