The blue lines run parallel to the red line. They indicate where each zone of the ice begins and ends, dividing the ice into three (3) equal parts. There are three zones in ice hockey that we'll learn about next called the defending zone, neutral zone, and attacking zone.
PRO TIP: The blue lines are used by referees to call offsides penalties. We will learn more about offsides in future chapters.
PRO TIP: The goal lines are used by referees to call icing penalties. We will learn more about icing in future chapters.