Macbeth starts the play as a loyal subject of the king. He is not a traitor. He kills the traitors. Something is needed to explain why he changes from a loyal subject of the king to a traitor. Suddenly the witches appear. They provide the explanation. Macbeth kills the king and becomes king. An explanation is needed why Macbeth loses his throne. The witches reappear. Macbeth changes residences. The woods attack the castle. His army changes sides. The witches explain the rise and fall of Macbeth. (In literature you only bring in witches or God when you have absolutely no other explanation for a major change for the behavior or actions of a particular individual. Macbeth is one such case.)
Witches in Macbeth serve as agents of fate and supernatural influences, driving the main character towards his tragic downfall. They symbolize the darker aspects of human nature, ambition, and the consequences of unchecked desires. The witches also contribute to the overall atmosphere of the play, adding a sense of intrigue and mystery.
They are characters in the play who turn up from time to time to make prophecies. In some other scenes or parts of scenes which were almost certainly not written by Shakespeare and are never performed they interact with a head witch called Hecate and gambol about singing cutesy songs.
The witches are a plot device that represent foreknowledge. The point is: If you knew the future, would it make you act differently? For Lady Macbeth at least, it certainly does, because it awakens a thirst to make Macbeth king in the quickest and most violent way. The witches represent that foreknowledge. In some productions, the witches have been made to represent a dominating force of evil which controls Macbeth's actions. Orson Welles's film is an example of this.
same evil ideas
The witches in Macbeth refer to themselves as the "weird sisters."
MacBeth meets the three witches with lady MacBeth
Macbeth.
The witches only gave Macbeth prophecies. It was his decision to do so after Lady Macbeth persuaded him. Although the witches' intentions was probably to cause this murder, the witches did not make Macbeth muder Duncan.
Macbeth did not like what the witches had told him.
No, the witches are proclaiming and predicting that Macbeth will be king and they are praising Macbeth.
Macbeth does.
Lady Macbeth echoes the words of the witches when she says "All hail, Macbeth, that shalt be king hereafter!". This echoes the witches' prophecy that Macbeth will become king.
Banquo wants to discuss the witches' prophecies with Macbeth and their potential significance. He also wants to share his suspicions about Macbeth's recent actions to see if he can uncover any truth behind Macbeth's sudden rise to power.
Banquo and Macbeth. And the other witches, of course.
I think that Macbeth was at first not as "worried" about the witches and their curses as then on in the play he finds out that every thing that the witches has been tellin him are true.