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134 pages, Kindle Edition
First published September 29, 2016
The basic definition of exposition sums up the pitfalls nicely: writing or speech intended to convey information or to explain.
That's also a definition for told prose. In writing terms:
It's when the science fiction protagonist gets into an anti-gravity car and the story stops to explain how it works and what it looks like.
It's when the romance protag has a date and the story stops to explain why this guy was particularly rough on her due to her past. [...]
Notice the key phrase: the story stops.[....]
However, sometimes you need to explain things to reads so they can understand and enjoy the story, and there's no natural way to write it without spending pages dramatizing something you could just explain in a line or two.
Explaining the story makes readers think you're insulting their intelligence. You don't think they can "get it" unless you explain it, and that can be a little condescending. If you've ever had someone explain a joke to you, you know how annoying that is.
Trust your readers to get it.