Spherands are a type of molecular structure that resemble a hollow sphere. They are composed of multiple interconnected units, often involving carbon or silicon atoms, which create a stable, three-dimensional shape. Spherands can encapsulate smaller molecules, making them useful in various chemical applications, including drug delivery and catalysis. These structures are part of a broader category known as cage compounds, which also includes other shapes like fullerenes and clathrates. Researchers study spherands to understand their properties and potential uses in materials science and nanotechnology, where their unique ability to trap and release substances can be advantageous.