Wikipedia
Classified advertising is a form of advertising which is particularly common in newspapers, online and other periodicals which may be sold or distributed free of charge. Classified advertisements are much cheaper than larger display advertisements used by businesses, although display advertising is more widespread. According to William A. Cohen, classified ads will bring "a greater return on your investment", dollar for dollar, than investments in display advertising, direct mail, or other media.
Usage examples of "classified advertising".
All Harney Sentinel reporters were trained in the paperwork of classified advertising, just in case the moment arose.
Ken and Sandy were reading proofs of long columns of classified advertising.
It was the first question I asked my old colleague - whose name I dare not confide here lest he find himself abruptly transferred to classified advertising telesales - when he came to collect me at the gate.
Hartford Police are still searching for the man who walked into the offices of the News-Times on Saturday and opened fire with a shotgun, killing three employees in the classified advertising department.