Foodservice operators face an even tougher battle in their emergence from the COVID-19 pandemic with "aggregator" delivery and ordering services such as Grubhub, iFood and Uber Eats showing increasing growth and power -- disrupting the traditional model.

Boston-based Bain & Company, which carried out in-depth and wide-ranging research commissioned by Sysco, the world's largest foodservice distributor, found that aggregators are driving more business to themselves than restaurants collectively.

What's a foodservice aggregator?