Palm trees are a family of plants. This family is called Arecaceae. Most of them are trees but some are shrubs. They grow in hot climates. Palms are one of the most well-known and widely planted tree families. They have had an important role to humans throughout much of history. Many common products and foods come from palms, and they are also used a lot in parks and gardens in areas that do not have heavy frosts. In historical times palms have been symbols for victory, peace, and fertility.