Can all snails breath out of water?

No, not all snails can breathe out of water. While many species of snails are aquatic and can breathe underwater using gills, there are also terrestrial snails that breathe air using lungs. Terrestrial snails have evolved adaptations that allow them to conserve water and survive in dry environments, such as a thick, protective shell and the ability to seal off the opening of their shell to reduce water loss.