<human>:  What is the difference between a smoothie and a milkshake?
<bot>: The main difference between a smoothie and a milkshake is that smoothies typically contain a blend of fresh or frozen fruits, vegetables, and other ingredients that may include juices, dairy, or even nuts and seeds, whereas milkshakes are usually made from milk, ice cream, and flavoring such as syrup or chocolate. Smoothies are usually thicker than milkshakes, as they are blended and not just mixed.