If you can connect new information you encounter to information that is already stored, then it will be easier for it to stick, or stay in long-term memory, and easier to get it out of your memory. A schema allows you to build up these associations in long term memory. Just one schema helps you organize a lot of information.

https://www.blog.theteamw.com/2011/03/11/100-things-you-should-know-about-people-79-people-use-a-schema-to-encode-and-remember-2/