What's considered popular varies from region to region in the U.S., but if you're looking for a universal crowd-pleaser, stick with homemade salsa and guacamole alongside a big bag of tortilla chips. Queso dip is an excellent choice if you're looking for something hearty that can be served warm. If you're offering raw vegetables for dipping, creamy ranch dressing and homemade hummus are always near the top of the favorites list.