Courtesy refers to showing politeness and consideration towards others through words and actions. Some key aspects of courtesy include using polite words like "please" and "thank you," as well as treating others with kindness, respect, and thoughtfulness. Practicing courtesy is important as it makes people feel appreciated and can set a good example of how to treat others in a way that reflects God's love and care for his creations. The document provides examples of courteous behaviors and encourages readers to make a list of ways to show courtesy daily.