Okay kiddo, so a legal periodical is kind of like a magazine, but instead of talking about fun stuff like toys and games, it talks about laws and legal stuff.
You know how grown-ups have rules they have to follow to keep things fair and safe? Well, sometimes those rules change or new rules are made, and the people who work on these rule changes write articles to explain them in legal periodicals.
These articles can be super helpful for lawyers and judges and anyone else who needs to stay up-to-date on the latest rules and laws. Like how you need to know the rules to the games you play, grown-ups need to know the rules of the law to do their jobs.
So legal periodicals are important because they help people stay informed about the rules and laws that affect them and how they do their jobs.