Final answer:
The preoperational stage is a developmental stage in Piaget's theory where children between 2 to 7 years old use symbols, engage in pretend play, and start using language. However, they can't understand adult logic or mentally manipulate information. They have a limited understanding of conservation.
Step-by-step explanation:
Piaget's second stage is the preoperational stage, which is from approximately 2 to 7 years old. In this stage, children can use symbols to represent words, images, and ideas, which is why children in this stage engage in pretend play. Children also begin to use language in the preoperational stage, but they cannot understand adult logic or mentally manipulate information. Children's logic is based on their own personal knowledge of the world. They have not developed an understanding of conservation yet, which is the idea that even if you change the appearance of something, it is still equal in size as long as nothing has been removed or added.