With Creative Commons (CC) licences, creators can tell the world that they’re happy for their work to be copied, shared or even remixed. When a creator releases their work under a CC licence, you know what you can and can’t do with the work. As a result, you can freely copy, share and sometimes modify and remix CC material without having to worry about copyright, as long as you follow the licence.
There are a number of content repositories that allow you to search their website for CC licensed content. You can do this using many popular search engine and search tools.