Mistletoes are a type of parasitic plant that grows on the branches of trees. They are known for their characteristic white berries and green leaves, which are often used as a Christmas decoration during the holiday season. Mistletoes are also traditionally associated with kissing, as it is believed that if two people stand beneath a mistletoe, they must kiss. The term "mistletoe" comes from the Old English words "misteltan," which means "little shrub with berries."