If you are interested in the history and development of advertising, most of the historical newspaper and magazine databases in the News tab will let search for adverts in their pages (often described as 'display ads'). There will often be an option in advanced search which will let you do this. Some particularly useful databases for this are:
Media directories contain contact details, short profiles and advertising rates for broadcasters and newspaper and magazine publishers.
Whether you are researching a project or preparing for a job interview, these databases can provide background, contact and financial information about companies.