Galettes, like crepes, are kind of a little bit like pancakes but much larger and way thinner than pancakes. Compared to pancakes, the batter is thinner and runnier, with no leavening agent to give them any lift.
Buckwheat crepes / galettes are typically served for lunch or dinner. They can be filled with all kinds of fillings like ham, cheese, bacon, eggs, vegetables (mushrooms, tomatoes, spinach...), meat or fish. But the most traditional filling is the “complète”: a slice of ham, emmental cheese and an egg.