Definition
In encyclopedia Britannica climax is described as "in dramatic and nondramatic fiction, the point at which the highest level of interest and emotional response is achieved" and state that "climax is achieved by the arrangement of units of meaning (words, phrases, clauses, or sentences) in an ascending order of importance." ("Climax")
Climax is the most intense and exciting part in a story, speech, etc. where all the points and plot lines usually come together.
Examples
The example encyclopedia Briannica uses is the following passage from the book Moby Dicky by Herman Melville:
All that most maddens and torments; all that
stirs up the lees of things; all truth with malice
in it; all that cracks the sinews and cakes the
brain; all the subtle demonisms of life and
thought; all evil, to crazy Ahab, were visibly
personified and made practically assailable in
Moby Dick.
Another example of a climax is the act of double suicide from the main characters of Romeo and Juliet by William Shakespeare.
The climax of the movie Aliens is a scene near the end where the main character is out of weapons and is forced to use a robo suit meant for loading cargo to fight the last remaining xenomorph to save not only herself but an orphan girl as well.
Works cited
"Climax." Britannica, T. Editors of Encyclopaedia (2016, February 11). climax. Encyclopedia Britannica. https://www.britannica.com/art/climax-literature
Adam Klusáček, 481063