In the world of fiction writing, there are many things to explore. Subplots, conflict, POV, characters, you name it. But have you heard of narrative and dialogue? If you’ve got a story, you’ve got to narrate it. If you’ve got a set of characters, they have to converse, i.e., talk. Talking in fiction writing is known as dialogue, and narrating or describing anything is known as narrative.
Now where’s the problem in that?
Too much of a good thing is usually a bad thing, and it applies here. Some writers use narrative a lot. Their characters aren’t talkers. It’s just page after page of narrative, how they did this, their journey, their perils, the people they met, the surroundings, and so on. All description. At which point your story looks like an essay which no one wants to read, rather than an amazing novel.