Molecular modelling refers to the use of computer simulations and mathematical algorithms to study the structure and properties of molecules. Synonyms for molecular modelling include computational chemistry, molecular simulations, computer-aided design, and computational biophysics. Computational chemistry involves the use of quantum mechanics and classical mechanics to model molecular structures and reactions. Molecular simulations use different software and algorithms to create a virtual world to understand the properties of molecules. Computer-aided design is the use of computers to design and test new chemical compounds. Computational biophysics is a field that applies physical principles, mathematics, and computer science to explore the behavior and function of biological systems at the molecular level.