WhatsApp, owned by Facebook, has nearly three billion users worldwide and is susceptible to hacking, which can lead to scams and unauthorized access. Signs of a hacked account include unusual messages from unknown contacts, unread messages marked as read, unexpected verification codes, and changes to profile information. If an account is compromised, users should delete any fake messages, check for unauthorized apps, review linked devices, inform contacts about the breach, and enable two-step verification for added security. To recover a hacked account, users can sign in with their phone number to receive a six-digit code, logging out any unauthorized users. If two-step verification is enabled and the PIN is forgotten, a seven-day waiting period will apply before regaining access.