"Kroger and Albertsons together operate nearly 5,000 stores and employ more than 710,000 people"! But I don't really understand the "The deal is expected to lea

"Kroger and Albertsons together operate nearly 5,000 stores and employ more than 710,000 people"! But I don't really understand the "The deal is expected to lead to a revolution in the supermarket sector, redefining what customers can purchase while they pick up milk and meat". What are we talking about here? Pick up a new car? A new fridge? Redefining is a big word.