Why do the outer surface of a vessel containing ice cream became wet?

The outer surface of a vessel containing ice cream becomes wet due to condensation. As the ice cream inside the vessel is cold, it lowers the temperature of the air around it, causing moisture in the warmer air to cool and condense into water droplets on the surface. Additionally, if there is any melting of the ice cream, that moisture can also contribute to the wetness on the outside of the vessel.