Chemist is a scientist who studies the composition, structure and properties of matter. They use their knowledge to develop new materials, products and processes. Chemists also investigate the reaction between different substances and the effect of temperature, pressure, light and other factors on these reactions. Chemists can work in many areas such as pharmaceuticals, food science, environmental protection and energy production. They use their expertise to solve problems in industry or research laboratories. In summary, a chemist is someone who uses chemistry to understand the world around us better and create new products for society's benefit.