Phishing is a scam that pretends that your bank account or online shopping account has been compromised. They will ask you to confirm your details and to unfreeze your account on an official looking website, which is totally fake. Once you have given your password and account number they are happy, but you won't be. Be very careful with internet banking. If you have doubts, close the window and go to the bank's website directly. Check the information you have from the bank and take the URL from there.