Creative Commons (CC) licenses are public licenses created by Creative Commons, a non-profit organization that enables the sharing and use of creativity and knowledge through free legal tools. You can use CC licences to tell other people what they are allowed to do with your work and what you can do with others.
Each work is automatically protected by copyright, which means that others will need to ask permission from the copyright owner. CC licenses let creators easily change copyright terms from the default of “all rights reserved” to “some rights reserved.”
Creative Commons licenses are not an alternative to copyright. They work alongside copyright and enable you to modify your copyright terms to best suit your needs.
The above applies to work you are using in your assignments. Other peoples images, videos, etc. will likely have some sort of CC licence attached to them, which can usually be found on the website where you found the work. Make sure that you check which licence applies to the work and that you have referenced the original work properly. To not do so would be considered plagiarism.
Visit the Creative Commons website for more information.