Casual Day is a term used to describe a day when people are allowed or encouraged to dress in a more relaxed and informal manner, usually within the context of their workplace. On this day, employees can wear comfortable clothing such as jeans, t-shirts, shorts, etc., instead of wearing formal business attire like suits and dresses. The purpose behind Casual Day is to create a more relaxed atmosphere in the office or work environment, allowing employees to feel more comfortable and at ease while they work. It can also serve as a way for companies to show appreciation for their staff by giving them permission to take a break from formal attire and enjoy a more casual day of work.