Final answer:
Assimilation is the process of using existing knowledge to deal with new information, while accommodation is the process of changing existing knowledge based on new information.
Step-by-step explanation:
Assimilation and accommodation are two processes that Jean Piaget identified as part of cognitive development in children. Assimilation is the process of using existing knowledge and understanding to deal with new situations. This means that children incorporate new information into their existing mental models or schemata.
On the other hand, accommodation is the process of changing existing mental models or schemata to fit new information or experiences. In this process, children modify their beliefs or understanding of the world based on new knowledge.