It's a place where you can share your knowledge and creativity with the world, explore other peoples' work, and license your own.
With just a few clicks of your mouse, its possible to have a copyright license for your own work. "The Creative Commons copyright licenses and tools forge a balance inside the traditional “all rights reserved” setting that copyright law creates. Their tools give everyone from individual creators to large companies and institutions a simple, standardized way to grant copyright permissions to their creative work. The combination of Creative Commons tools and their users is a vast and growing digital commons, a pool of content that can be copied, distributed, edited, remixed, and built upon, all within the boundaries of copyright law."
Creative Commons has made it easy for anyone to search through selection of some of the world's greatest multi-media search engines for CC licensed material. It's as easy as typing in your search query and selecting the site.
A few of the sites included in the search:
Open Clip Art Library
Once you have the work you wish to use, proper attribution to the creator of that work is needed. Creative Commons Australia created an easy-to-follow guidelines sheet for giving credit where credit is due.