Which licenses do Creative Commons offer?

Before explaining the different licenses it is important to be familiar with the symbols that represent the different licenses:

Attribution (by): You let others copy, distribute, display, and perform your copyrighted work — and derivative works based upon it — but only if they give credit the way you request.

Non-commercial(nc): You let others copy, distribute, display, and perform your work — and derivative works based upon it — but for non-commercial purposes only.

No Derivative Works(nd): You let others copy, distribute, display, and perform only verbatim copies of your work, not derivative works based upon it.

Share Alike (sa): You allow others to distribute derivative works only under a license identical to the license that governs your work.

Creative Commons offers 6 main licenses. Below those 6 are listed from the most restricted to the less restricted ones:
1.Attribution Non-commercial No Derivatives (by-nc-nd)

2.Attribution Non-commercial Share Alike (by-nc-sa)

3.Attribution Non-commercial (by-nc)

4.Attribution No Derivatives (by-nd)

5.Attribution Share Alike (by-sa)

6.Attribution (by)

To understand the different main licenses in a fun way, take a look at the comic [1]

Please note that those are only the main licenses, CC also offers other licenses (special licenses for software or for allowing only snippets of the work to be remixed)

For more information[2]