Preoperational stage: This is one of the stages in the theory of cognitive development which was introduced by one of the most influential psychologists named Jean Piaget.
According to Piaget, this is the second stage in his theory and starts at the age of two years and lasts through age seven of an individual's life. In this stage, a child began to talk, engages himself or herself in symbolic play, uses basis local thoughts, manipulates symbols, etc.
