Aromatherapy has been used for over 3,500 years to improve psychological and physical well-being. It involves using aromatic plant oils, including essential oils extracted from herbs, flowers, and fruits. The ancient Egyptians burned incense for religious rituals and to carry prayers to the gods, while the Chinese also used aromatic plants. Aromatherapy can be used to alleviate stress, headaches, insomnia, and digestive issues by inhaling scents or through massage with scented oils. It is considered both a complementary and alternative therapy that affects mood and cognition through aromatic compounds.