A test tube rack is a laboratory tool designed to hold and organize test tubes securely. Typically made from materials like plastic or wood, these racks come in various sizes and shapes to accommodate different numbers of test tubes. They are essential for keeping test tubes upright, preventing spills, and allowing for easy access during experiments. Test tube racks are commonly used in scientific settings, such as chemistry and biology labs. They help maintain a safe and efficient workspace by providing a designated area for test tubes, which can contain liquids, samples, or reactions. Proper organization is crucial for accurate results and effective experimentation.