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The correct answer is that no one knows.

A popular theory at the moment is that a large meteor struck the earth 65 million years ago. There is evidence of large meteor strike at a site called Chicxulub, near Mexico.

There are alternative theories such a volcanism. There are immense lava flows that date back to the time of the dinosaurs, indicating that volcanic activity was at a peak contributing to a climate change which dinosaurs could not survive.

Increased competition for resources from the growing mammal kingdom provides yet another theory.

There is evidence for all these theories, so it could just be the combined effect of all these factors that led to the dinosaurs demise.

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