Molecular cages are specialized structures formed by molecules that create a hollow space, resembling a cage. These cages can trap other molecules or ions inside, allowing for selective storage or transport. They are often made from organic compounds, such as cucurbiturils or cage compounds, which can be designed to have specific sizes and shapes. These structures have various applications in fields like chemistry, materials science, and medicine. For example, molecular cages can be used to deliver drugs in a targeted manner or to capture harmful substances from the environment. Their unique properties make them valuable tools for research and technology.