In the United States, breakfast is eaten from perhaps 6 a.m. to 9 a.m. and is often a fairly light meal with a fairly limited and stereotyped number of food possibilities. A cup of coffee, a roll and butter, a bowl of cereal... perhaps an egg, perhaps scrambled eggs and bacon. Lunch is eaten at about noon, and can be light, medium-sized, or heavy. Brunch is intended to combine breakfast and lunch. If you are eating brunch, you would not eat breakfast first, and you would not eat lunch afterwards. So, it is a large meal. And it is eaten in the middle of the morning, perhaps 10 or 11 a.m. It would contain a good selection of breakfast-like and lunch-like foods.

Brunch is a hybrid word between breakfast and lunch. So it's just kind of a heavier lunch than you might ordinarily have. That's about it.

Brunch is an early lunch. It's at an awkward time in-between breakfast and lunch

Brunch usually features cocktails. In the U.S., brunch is a weekend and holiday affair.

'Difference'