A structural formula is a model that shows how the atoms are arranged in a molecule. It uses lines to represent the bonds between atoms, and the different types of atoms are represented by different symbols. For example, carbon atoms are represented by the letter C, hydrogen atoms are represented by the letter H, and oxygen atoms are represented by the letter O.

Structural formulas can be used to show the structure of simple molecules, such as water (H2O) and methane (CH4). They can also be used to show the structure of more complex molecules, such as proteins and DNA.

Structural formulas are important because they allow scientists to understand the structure and properties of molecules. This information can be used to develop new drugs, materials, and technologies.