Creative Commons is a global nonprofit organization that enables sharing and reuse of creativity and knowledge through the provision of free legal tools. It offers licenses to facilitates share, reuse and remix of materials. The licenses helps creators and other rights holders to offer certain usage rights to the public, while reserving other rights.
A graphical overview of Creative Commons License and their descriptions are presented in the following figure.
For more information see here: https://creativecommons.org/licenses/