Henna powder, also known as Lawsonia inermis, is a natural plant-based powder derived from the leaves of the henna plant. It has been used for centuries in various cultures for its vibrant, reddish-brown dye, commonly applied to the skin and hair. When mixed with water or other natural ingredients, henna powder forms a thick paste, ideal for creating intricate designs, such as mehndi, or for coloring hair.