The European Union (EU) Competition Law is a set of rules that help to make sure that businesses in the EU countries treat their customers fairly. It also helps stop companies from getting too big and powerful by not letting them do things like, taking over other businesses, or setting prices too high. It also stops companies from doing things like making secret deals that get them an unfair advantage over other companies. In short, it helps make sure that everyone plays fair and gets an equal chance to do well in business.