Bob gets an e-mail addressed from his bank, asking for his user ID and password. He then notices that the e-mail has poor grammar and incorrect spelling. He calls up his bank to ask if they sent the e-mail, and they promptly tell him they did not and would not ask for that kind of information. What is this type of attack called?

This type of attack is called as phishing emails.

Explanation:

Normally any bank will not ask end user about login details such user id, password, pin number in email. So bob as think and before responding the mail. Moreover this type email to be considered as hacker email, who want to access the bob accounts and do access his account and steal money from bob accounts.

Luckily bob contacted bank to stop further hackers not to his accounts. Since it is grammar mistake bob understood it is hackers who asking bob user id and password.

Bob has prompted these type of mails are called phishing emails. Better to avoid it.