In literature, some examples of climax are when Romeo and Juliet die in "Romeo and Juliet," and when Wilbur in "Charlotte's Web" is declared the winner at a county fair and his life is saved. Another example of climax is in "The Hunger Games," when Peeta and Katniss resolve to eat poisonous berries instead of killing one another.
The climax may be the moment of greatest moment of tension in a story. It is preceded by the rising action and itself precedes the falling action of the story. The simplest way to view it is as the turning point in the plot of a story, play or other drama.