Structural biology is a branch of biology that focuses on studying the structure of biological molecules and how they interact with each other. This field utilizes techniques such as X-ray crystallography, nuclear magnetic resonance (NMR) spectroscopy, and electron microscopy to determine the three-dimensional structure of proteins, nucleic acids, and other macromolecules. By understanding the structures of these molecules, researchers can gain insights into their functions and develop new drugs and therapies for various diseases. This field plays a crucial role in fields such as drug design, biotechnology, and bioinformatics.