At restaurants in the United States, it's typical to tip. That is, customers usually leave a little extra money for the server when they pay their bill. Sometimes called a gratuity, the "extra" left behind varies widely depending on the customer and how they feel about the service. However, it's usually between 10-20% of the bill, so a customer who owes $20 for their food and drink may leave an extra four dollars for the server as a tip. While four dollars may seem like small change, in truth tips are a big deal for servers. In this course, we'll learn why this is and what your responsibilities are.