To what does Tituba confess?

In The Crucible, Tituba confesses that she has dealt with the Devil, worked for him unwillingly, and seen other witches in Salem.

Her confession comes under extreme pressure. At first, she denies Hale’s question about whether she made a “compact with the devil,” and she says Abigail begged her to conjure spirits. But Parris threatens to whip her to death if she does not confess, and Putnam says she should be hanged. Terrified, Tituba changes her story: she says she did not want to work for the Devil, but he forced her, and she claims there are many witches in Salem.

She then names Sarah Good and Mrs. Osburn as witches. The people around her coerce her into giving those names: Putnam suggests Sarah Good and Mrs. Osburn, and Hale tells Tituba that she will be blessed if she confesses whom she saw. Her confession gives Abigail a way to save herself, so Abigail immediately follows Tituba’s example and begins naming more women as witches, with Betty joining in.

Tituba’s confession turns suspicion into a public witch hunt. A terrified, powerless woman learns that denial will be treated as guilt, while confession and accusation will be rewarded.