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
(below 2 °C or 35 °F). It becomes more malleable as its
temperature increases.
Learn more on Wikipedia