The Transportation Security Administration (TSA) enforces regulations to ensure the safety of air travel. These rules include restrictions on carrying liquids, gels, and aerosols in carry-on bags, which must be in containers of 3.4 ounces or less and fit into a single quart-sized bag. Additionally, travelers must remove their shoes, belts, and jackets during security screening. Passengers are also prohibited from bringing certain items on board, such as sharp objects, firearms, and explosives. It's essential to check the TSA website for the latest updates and guidelines before traveling, as regulations can change frequently to enhance security measures.