Traditional units are measurement systems that have been used for centuries in various cultures. These units often include measurements for length, weight, and volume, such as inches, pounds, and gallons. They are typically based on everyday objects or human dimensions, making them relatable and easy to understand for people in those societies. Many countries have transitioned to the metric system, which is based on units like meters, kilograms, and liters. However, traditional units remain in use in some regions, particularly in the United States, where they are commonly used in everyday life, such as in cooking and construction.