The preschool years mark a crucial period in a child's cognitive development, characterized by significant advancements in various cognitive processes. This scientific article aims to explore and analyze the development of cognitive processes in preschool children. By examining key cognitive domains such as attention, memory, language, problem-solving, and executive functions, this article provides insights into the intricate interplay of biological, environmental, and experiential factors shaping cognitive development during the preschool years. Understanding these processes is essential for educators, parents, and policymakers to design effective interventions and educational programs that foster optimal cognitive growth in preschool children.