Botany (from the Greek: βοτάνη [botane] = plant), also called plant science(s), plant biology or phytology, is the discipline of biology that studies the forms of life in the plant world (flora), especially in relation to their anatomy, physiology, utility, classification, and ecology. The most complex organisms studied by botany constitute the kingdom of plants (or Plantae).

In the past, everything that was not considered animal was considered a plant, vegetable. Currently, only autotrophic multicellular organisms are considered part of the Plant Kingdom: the others are assigned to the kingdoms Monera, Protist, or Fungi.