Facebook delays deleting an account for 90 days in case the person changes their mind. If the person logs in during these 90 days, the account will be restored.
After the 90 days, your Facebook account is permanently deleted and cannot in any way be retrieved.
Facebook takes 90 days to permanently remove a deleted account's information that are stored in backup systems. During the 90 days, the information isn't accessible to other people.
After deleting your account, people will no longer be able to see it on Facebook.
After deleting your account, your friends might still be able to see messages that were sent from your account.
Facebook may save your log records after deleting your account but it will be disassociated from any information that personally identifies you.
When deleting your Facebook account, Facebook will give you the option to download a copy of your info.
Since most apps have the option to log in with Facebook and be connected via your Facebook account, when you delete your Facebook account, you will lose access to these apps, which might cause some logging in problems.