While corporate banking is the portion of the banking sector that deals with corporate customers, retail banking refers to the division of a bank that deals directly with retail customers.
Depository refers to a location where something is placed for storage or protection, as well as a business like a bank or savings association that accepts customer currency deposits.
It's understandable why some individuals might conflate the terms APR and APY. Both are employed in the computation of interest for credit and investment products.