"Red wine" refers to a type of alcoholic beverage made from dark-colored grapes that have been fermented. It is called red wine because of its red or purple color. Full definition
I noticed that in the marinade ingredients you list 1/4 cup of red wine vinegar, but in Step 2 you say to use rice wine vinegar. (oneingredientchef.com)
Mix all your veggies in a large bowl with enough olive oil to coat, a couple of tablespoons of red wine vinegar, 2 t finely chopped rosemary, salt & pepper. (mixedgreensblog.com)
Pour in red wine vinegar and use a wooden spoon to scrape brown bits off bottom of pan so they add flavor to hash. (buzzfeed.com)