Pedialyte is an oral rehydration solution (ORS) designed to treat and prevent dehydration in children. It contains a balanced mix of electrolytes, including sodium, potassium, and chloride, as well as sugar and water. Pedialyte is effective in replenishing lost fluids and minerals, making it a common recommendation by pediatricians for children who are experiencing dehydration due to diarrhea, vomiting, or other illnesses.