A product, generally software but also images and content, distributed with minimal licensing restrictions. Generally a user is free to use, modify and redistribute open source code and content as long as they include the original attribution and make their variation freely available under the same licensing restrictions. A variety of open source licenses exist including the GNU Public License (GPL), Creative Commons and others.
Advantages of open source software cost (generally free) and portability. Since the open source model is widely used, broad generalizations about open source software are impossible. However many open source projects (such as the WordPress CMS) are supported by a large and knowledgeable community.
See also: Proprietary Software