Toys, like play itself, serve multiple purposes in both humans and animals. They provide entertainment while fulfilling an educational role. Toys enhance cognitive behavior and stimulate creativity. They aid in the development of physical and mental skills which are necessary in later life.

One of the simplest toys, a set of simple wooden blocks is also one of the best toys for developing minds. Andrew Witkin, director of marketing for Mega Brands told Investor's Business Daily that, "They help develop hand-eye coordination, math and science skills and also let kids be creative."[8] Other toys like Marbles, jackstones, and balls serve similar functions in child development, allowing children to use their minds and bodies to learn about spatial relationships, cause and effect, and a wide range of other skills as well as those mentioned by Mr. Witkin.
Two children playing with paddle balls, a painting by the Chinese artist Su Hanchen (苏汉臣, active 1130s-1160s AD), Song Dynasty

One example of the dramatic ways that toys can influence child development involves clay sculpting toys such as Play-Doh and Silly Putty and their home-made counterparts. Mary Ucci, Educational Director of the Child Study Center of Wellesley College, demonstrates how such toys positively impact the physical development, cognitive development, emotional development, and social development of children.[9]

Toys for infants often make use of distinctive sounds, bright colors, and unique textures. Through play with toys infants begin to recognize shapes and colors. Repetition reinforces memory. Play-Doh, Silly Putty and other hands-on materials allow the child to make toys of their own.

Educational toys for school age children of often contain a puzzle, problem-solving technique, or mathematical proposition. Often toys designed for older audiences, such as teenagers or adults demonstrate advanced concepts. Newton's cradle, a desk toy designed by Simon Prebble, demonstrates the conservation of momentum and energy.

Not all toys are appropriate for all ages of children. Some toys which are marketed for a specific age range can even harm the development of children in that range.[citation needed]