An ice cream float or ice cream soda, also known as a spider in Australia and New Zealand, is a chilled beverage that consists of ice cream in either a soft drink or a mixture of flavored syrup and carbonated water.

Ice cream is a frozen dessert typically made from milk or cream that has been flavoured with a sweetener, either sugar or an alternative, and a spice, such as cocoa or vanilla, or with fruit, such as strawberries or peaches. Food colouring is sometimes added in addition to stabilizers. The mixture is cooled below the freezing point of water and stirred to incorporate air spaces and prevent detectable ice crystals from forming. It can also be made by whisking a flavoured cream base and liquid nitrogen together. The result is a smooth, semi-solid foam that is solid at very low temperatures. It becomes more malleable as its temperature increases.