What are "norms?" Why is it important for and organization or group to have a set of "norms" by which they function?

Something that is usual, typical, or standard is a norm.Norms are important to society because they provide guidelines on how to act in different situations. Social norms help to create order in society by allowing humans to understand typical behaviors in their culture.
Every group develops its own customs, habits and expectations for how things will be done. These patterns and expectations, or group norms as they’re sometimes called, influence the ways team members communicate with each other. Norms can help or hinder a group in achieving its goals. This also works for organizations too! Norm setting can only work if the team is truly able to agree. Norms won’t stick if members have reservations about them.