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Dry ice is solid carbon dioxide, the frozen form of the gas we exhale and that plants use to grow. It's useful in many practical applications because it's extremely cold and turns directly into gas without leaving a liquid residue, making it valuable for preserving frozen foods, creating special effects, and other industrial purposes.
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Subliming dry ice pellet, with white frost on the surface
Dry ice is the solid form of carbon dioxide. It is commonly used for temporary refrigeration as CO2 does not have a liquid state at normal atmospheric pressure and sublimes directly from the solid state to the gas state. It is used primarily as a cooling agent, but is also used in fog machines at theatres for dramatic effects. Its advantages include lower temperature than that of water ice and not leaving any residue (other than incidental frost from moisture in the atmosphere). It is useful for preserving frozen foods (such as ice cream) where mechanical cooling is unavailable.