Ad agencies are usually divided into departments:
Administration – management and accounting operations.
Account management – the liason between agency and client, handled by
an account executive (AE).
Creative department – develop idea to ad. Involves copywriting,
graphic design, production for each medium.
The media department – make decisions about where and when to place
Ad and then buy the appropriate time or space. The effectiveness of a given
placement is judge by its cost per thousand (CPM).
Market research – test product viability in the market.
Public relations departments (for some agencies).