To delete a Twitter (now called X) account, the key step is to deactivate the account first by logging in on the Twitter website (not the mobile app). After deactivation, if you do not log back in for 30 days, the account and all associated data will be permanently deleted.

Step-by-step process to delete a Twitter account:

1. Log in to the Twitter website with the account you want to delete.
2. Click on "More" in the left menu and select "Settings and privacy."
3. Go to "Your account" and then click "Deactivate your account" at the bottom.
4. Read the information about deactivation and confirmation that the account will be deleted after 30 days of inactivity.
5. Confirm by entering your password and clicking "Deactivate."
6. Do not log in again during the 30-day period to ensure permanent deletion.

Important Notes:

• Deactivation is the initial step; deletion happens after 30 days of no login.
• You can reactivate within 30 days by logging back in, which cancels deletion.
• Account deletion cannot be fully done via mobile apps; use a web browser.
• Tweets and profile become invisible immediately after deactivation.
• After deletion, some indexed tweets might still appear on search engines for some time.

This method ensures your Twitter account is fully deleted after the waiting period if you remain inactive on the account during that time.