If you understand single origin, it follows that a coffee blend is a mix of several different single origin coffees. And you would be about 95% right. There’s a little bit more that goes into it.
In addition to mixing several different single origin coffees together, sometimes roasters will blend together the same single origin coffee roasted to different roast profiles. That’s a not-often-used method of blending that can have some interesting results.
Some blends are really popular and almost every roaster has one. “Breakfast Blends” tend to be brighter and fruitier.Espresso blends (notespresso roasts) work really well when brewed in an espresso machine and used to make lattes or cappuccinos.