Plants are essential to all life on Earth. They are special because they are able to make their own food by a process called photosynthesis where they take carbon dioxide from the atmosphere and turn it into sugar. The sugars can then be used for energy for growth and many more functions but the plant material provides the basis of almost all food chains.
Botany is also called plant science(s), plant biology or phytology, is the science of plant life and a branch of biology. A botanist is a plant scientist or phytologist is a scientist who specialises in this field.