"A Sound of Thunder" is a science fiction short story by Ray Bradbury, first published in 1952. The story is set in the future where time travel has become a reality. Eckels, a wealthy hunter, goes on a guided safari to the past to hunt dinosaurs. However, he is given strict instructions to not disrupt the past as it could have dire consequences on the present. Despite the warning, Eckels makes a fatal mistake, resulting in a chain of events that alters the course of history. The story delves into the butterfly effect, exploring the idea that even the smallest change in the past can have significant and unforeseen consequences in the future. As Eckels grapples with the repercussions of his actions, the story raises questions about the fragility of time and the ethical implications of tampering with the past. "A Sound of Thunder" is a classic sci-fi tale that leaves readers contemplating the power and consequences of time travel.