A tube is a cylindrical container typically made from materials like plastic, metal, or cardboard. It is designed to hold various substances, such as creams, gels, or pastes. Tubes are commonly used for packaging products like toothpaste, ointments, and cosmetics, allowing for easy dispensing and storage. Tubes often feature a nozzle or opening at one end, which helps control the amount of product released. They can be sealed to prevent contamination and maintain freshness. The design of a tube makes it convenient for both consumers and manufacturers, as it is lightweight and can be easily transported and stored.