What is it called when an attacker convinces you to enter personal information at an imposter website after receiving an email from a person masquerading as an employee from your bank?

Phishing.

Explanation:

Networks and computer systems in a network are susceptible to cyber attacks. A cyber attack is a networking term that describes a situation where a network is penetrated by a malicious process or program induced by an attacker or attackers.

A cyber attacker's sole intention is to steal information needed to achieve a malicious and devastating action to a client's personal assets. An example of such attacks is phishing.

Phishing is an attack that collects client's personal information at an imposter website after receiving an email from a person masquerading as an employee from a bank.