Told: The store blew up, and the shopkeeper died soon after.
Shown: I sensed a short, deep silence, followed by a tremor I felt throughout my body. As I looked, I saw the bricks of the local shop erupt from the wall and spray onto the street. A grey smoke took shape and expanded from under the ceiling, venting itself up the side of the building. Then I saw a short man, eyes cast to the street, his balding crown burnt and scarred, stagger to the curb. Before I could even step he fell to all fours, then slumped into the road, and did not move again.
Telling, or exposition, is important to get the reader to important parts of the story. Once there, you want to draw them into the experience of what's happening by creating and fixing an impression of it. Often when readers express frustration with being told, they mean a lot of things that could have been interesting were only related as facts.