The References page is the page at the end of your paper or project listing every source you quoted or paraphrased. Every time you use someone else's ideas within your own work, you must acknowledge them in the format your instructor prescribes (in this case, APA citation style).
These are not words/ideas you simply throw into your paper. The purpose of including sources in your paper is to infuse your own thoughts and ideas with theirs, and to participate in the scholarly conversation around the topic of your paper/project. The References page is the acknowledgement of that infusion and conversation.
(image by flickr user @rondmac)