Many like to use the term in this Internet age, but I've never known what a "comfort food" is.
"Comfort food" predates the internet by several decades I would think. Down here in the South, I've heard it as long as I remember. For me, it's any food that creates a sense of nostalgia and of times past. And if it tastes good, that's a plus. When I make pimento cheese using my mom's recipe and eat it, it reminds me of being a kid and being around mom and growing up in Miami. There are others, but most of them I can't get to taste like mom's recipes, so they don't have the same effect.