Final answer:
Barbecue sauce is the base used for BBQ chicken pizza, providing the smoky and tangy flavor profile that complements the chicken and other toppings.
Step-by-step explanation:
The base sauce for BBQ chicken pizza is Barbecue sauce. This sauce is often used as a flavoring technique in various styles of barbecue across the United States. For instance, the sweet, dark Kansas City BBQ sauce, well-known for its use on meats, is a popular choice and is the inspiration for what is typically used on BBQ chicken pizzas. Other regional sauces include South Carolina's mustard-based sauce, East Carolina's vinegar-and-hot pepper sauce, and Louisiana's cayenne pepper-flavored sauce. In contrast, some regions like Memphis and Santa Maria prefer a dry rub over a wet sauce. However, for creating a BBQ chicken pizza, barbecue sauce is specifically utilized to provide the characteristic smoky and tangy flavor profile that complements the chicken and other toppings.