What role do the witches play in Macbeth?
The witches serve two main functions within the play. As witches, they immediately bring a supernatural element to the play, which furthers the theme of "fair is foul, and foul is fair." Additionally, they serve as the instruments of fate by delivering their prophecies to Macbeth, who is then motivated to pursue his ambition.
The witches in Macbeth represent the influence of supernatural forces on human affairs. They are depicted as malicious within the play, and their activities are simultaneously tied up with themes of destiny as well as of corruption. They serve as enablers to Macbeth , and in this capacity, they play a role in shaping his murderous rise to power (and also in his eventual downfall). With that in mind, they have a critical role within the play, if not an active one: they take little decisive action on their own terms (in contract to a character such as Macbeth), but their manipulation and influence...
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The witches make the play dominant by their evil spirit and movte the main character to its tragedy. Apart from it,it must be added that they were devoted to their profession,whereas the hero,Othelo was not devoted to his profession because he follows weak cree.