Final answer:
The DTap vaccine is given to the children at specific ages to protect against diphtheria, tetanus, and pertussis.
Step-by-step explanation:
The DTap (diphtheria, tetanus, and pertussis) vaccine is given to children at specific ages to provide protection against these diseases. According to the CDC, children should receive doses of the DTaP vaccine at 2, 4, 6, and 15-18 months of age, and another dose at 4-6 years of age.