Phenyl is a chemical group derived from benzene, consisting of a six-carbon ring with five hydrogen atoms. It is represented by the formula C6H5 and is often used as a building block in organic chemistry. Phenyl groups can be found in various compounds, influencing their properties and reactivity. In many applications, phenyl is part of larger molecules, such as in the structure of phenol or aniline. It plays a crucial role in the synthesis of pharmaceuticals, dyes, and plastics, making it an important component in both industrial and laboratory settings.