What is the role of catharsis in Macbeth?I just need a few examples of it and how it relates to Macbeth as a story in general. thanks!

Another way in which many of the audience of Shakespeare's
Macbeth pity the tragic figure of Macbeth in his destructive
obsession with ambition.  When he is made Thane of Cawdor by King Duncan in Act I, he is
a hero, admired for his bravery and skill.  But, like so many, he becomes seduced by
ambition and the preternatural world as well, losing his integrity, his wife, and,
finally, his life.  The temptress of ambition takes from him the essence of his being as
a human, leaving him with a meaningless life.  Sadly, Macbeth realizes this in his
soliloquy in Act V as he speaks of life as

readability="13">

...a poor
player 

That struts and frets his hour upon the
stage

And then is heard no more.  It is a
tale

Told by an idiot, full of sound and
fury,

Signifying nothing
(5.5.24-28)

This condition of
the seductiveness of power is also one that is feared by people, for so often the
attainment of power leaves people empty as they have sold their souls to the other world
of evil, sacrificing much of their humanity as does Lady Macbeth in her life as "a
walking shadow." 

In Act IV, Scene 3, it is this very fear
of the evil of power and its effects that Malcolm exhibits in his distrust of the
motives of Macduff who has come to England to seek Malcolm's help in restoring the
rightful ruler to Scotland.  For, he wonders if Macduff is a paid agent of Macbeth; he
questions Macduff as a result and feigns corruption in himself in order to elicit
Macduff's true feelings.  When Macduff exclaims, "O, Scotland!" Malcolm realizes that
the man loves his country and is loyal, so he tell Macduff the truth about
himself.