Seven-layer dip is a snack dip served with tortilla chips as an appetizer in the United States.
As is so often the case with numbered lists like this, there is no definitive list of the seven ingredients in Seven-Layer Dip. All recipes call for at least:
“I tucked into D.J. Taylor's Kept: A Victorian Mystery hoping that it would get my summer reading off to a good start—it's not so easy to find fiction that goes with margaritas but doesn't turn your brain to seven-layer bean dip. And, indeed, Mr. Taylor keeps both the pages and the brain turning over pleasantly.”