Just think about it: one billion. This is by far the biggest known hack of user data ever.
Yahoo says that the breached data includes names, email addresses, phone numbers, birthdays, hashed passwords, and a mix of encrypted and unencrypted security questions and answers. Yahoo then says the breach does not include unencrypted passwords, credit card numbers, or bank account information. Specifically, the company says that financial data is stored in a separate system that it doesn’t believe was compromised.
Still, if you have a Yahoo account, it is time to change your passwords and other sensitive information. If you use the same passwords and other identifying or private information on other web sites, you should change them EVERYWHERE.
Details about the billion hacks may be found at: https://goo.gl/uqtfR9.