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Questions usually asked related to Apparitions are:
What is Apparition?
In how many Shakespeare plays do we come across Apparitions?
How many Apparitions are there in Macbeth?
So, here I am with all the answers. Please comment if you want to add on something, or want me to answer some other questions. And, if you are happy with the explanation, please like my post to motivate me. 😎

What is Apparition?
Apparitions are minor characters in the play Macbeth written by William Shakespeare. It is his shortest tragedy and was published in First Folio of 1623.
In how many Shakespeare plays do we come across Apparitions?
We will find Apparitions in the play Macbeth. These represent supernatural phenomena shown to Macbeth by the Witches, in Act IV, Scene 1 . These specters are designated as the First, Second, and Third Apparition; each has a distinctive appearance and message.
How many Apparitions are there in Macbeth?
The First Apparition is described in the stage direction at Act IV, Scene 1 as ‘an armed head’, and it warns Macbeth to beware of Macduff.

The Second, ‘a bloody child’ (Act IV, Scene 1), declares that ‘none of woman born / Shall harm Macbeth‘.
The Third Apparition is ‘a child crowned, with a tree in his hand‘ (Act IV, Scene 1), and it adds that ‘Macbeth shall never vanquish’d be, until / Great Birnam wood to high Dunsinane hill / Shall come against him‘. Macbeth naturally receives these prophecies as ‘Sweet bodements!’ and assurances that he will not be killed by his enemies.
Analysis

The tensions of the play tighten with this act which is the first intimation of its climax. Macduff is brought into focus for the first time, yet Macbeth’s defeat is made to seem impossible. These portents come from the same supernatural agency whose prediction of Macbeth’s rise, in the Witches’ prophecy of Act I, Scene 3, was very much accurate.
In Act 5 the prophecies of the Apparitions are presented, though not as Macbeth anticipates. We can see that the Apparitions bear clues as to Macbeth’s true fate. The armored head that is the First Apparition forecasts the severing of Macbeth’s own head after Act V, Scene 8. The Second Apparition, a bloody child, suggests Macduff ‘from his mother’s womb / Untimely ripp’d‘ (Act V, Scene 8). The Third Apparition, the child crowned, foretells the reign of the young Prince Malcolm with which the play closes, and the tree it bears refers to his decision to have his soldiers bear boughs cut from Birnam wood as they march on Dunsinane.
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