There are many different styles of BBQ sauce, each with its own unique flavour profile and regional variations. Here are some of the most popular styles of BBQ sauce:

1. Kansas City-style BBQ sauce: This thick and sweet sauce is made with ketchup, brown sugar, molasses, and spices like garlic and onion powder. It's a classic all-purpose sauce that goes well with all kinds of meats.

2. Texas-style BBQ sauce: This sauce is tomato-based and typically includes a mix of spicy and sweet flavors. It often contains chili powder, cumin, and smoked paprika, as well as ingredients like brown sugar, vinegar, and Worcestershire sauce.

3. Memphis-style BBQ sauce: This sauce is usually thinner than other styles and is made with a tomato or vinegar base. It's often tangy and slightly sweet, with a hint of spice from ingredients like cayenne pepper or hot sauce.

4. Carolina-style BBQ sauce: This sauce is divided into two styles - Eastern and Western. Eastern Carolina-style sauce is a vinegar-based sauce that is tart and tangy, with a bit of heat from red pepper flakes. Western Carolina-style sauce is a tomato and vinegar-based sauce that is sweeter and more savory, with a tangy finish.

5. Alabama-style white BBQ sauce: This unique sauce is made with mayonnaise, vinegar, and black pepper, and is commonly used as a dip for chicken or as a dressing for coleslaw.

Overall, the different styles of BBQ sauce offer a wide range of flavours and textures to complement a variety of grilled or smoked meats.