A business day is a term that refers to any day of the week that is not a weekend day (Saturday or Sunday) or a national holiday. Business days are typically defined as Monday through Friday, though they may vary by region or industry.

Business days are important for a variety of reasons, particularly when it comes to financial transactions and legal agreements. For example, if you need to make a payment or file paperwork with a government agency, you will typically need to do so on a business day. Likewise, if you need to conduct a business meeting or schedule an appointment, you will usually need to do so during business hours on a business day.
While the term “business day” is often used interchangeably with “working day,” it’s important to note that not all working days are business days. Working days can include weekends or other days off, such as holidays, that fall outside of a standard workweek.
In the United States, federal holidays are considered non-business days. Some of the most common federal holidays include New Year’s Day, Memorial Day, Independence Day, Labor Day, Thanksgiving Day, and Christmas Day. However, it’s important to note that not all businesses observe federal holidays, and some may close on additional days.
In addition to federal holidays, many businesses and organizations observe local or industry-specific holidays. For example, some businesses may close for religious holidays, while others may close to celebrate a local event or festival.
The concept of business days is also important when it comes to shipping and delivery times. For example, if you order a package on a Friday, the estimated delivery time may not include Saturday or Sunday, and the package may not be delivered until the following Monday.
Overall, understanding what constitutes a business day is important for anyone who needs to conduct business or financial transactions, schedule appointments or meetings, or plan for shipping or delivery times. By keeping track of business days and understanding how they impact your daily life, you can stay organized and avoid potential setbacks.