What is the part of a plot in which hero faces major obstacle or problem?

The part of a plot in which the hero faces a major obstacle or problem is known as the "climax." The climax is the most intense and exciting part of the story, as the protagonist confronts the main conflict and must overcome significant challenges to achieve their goals. The resolution follows the climax and presents the outcome of the hero's actions, tying up loose ends and concluding the story.