What is Bank Teller?

Legal Definition
A bank teller (often abbreviated to simply teller) is an employee of a bank who deals directly with customers. In some places, this employee is known as a cashier or customer representative. Most teller jobs require experience with handling cash and a high school diploma. Most banks provide on-the-job training.

Tellers are considered a "front line" in the banking business because they are the first people that a customer sees at the bank.
-- Wikipedia
Legal Definition
See Teller.
-- Black's Law Dictionary