Informative advertising
Informative advertising is advertising that is carried out in an informative manner. The idea is to give the ad the look of an official article to give it more credibility. Also, informative ads tend to help generate a good reputation.
In some circumstances a business might be required to run informative advertising as part of resolving a lawsuit. Tobacco companies are one of the more notable examples of this.
Alcohol producers have been running advertisements with the general message being don't drive drunk.
Some unions and trade organisations have run informative advertisements to promote public awareness of what they see as the value of their organization.
Governments agencies use this form of advertising. California State Highway Patrol ran a "click-it or ticket" campaign explaining the risks involved in not using a seat belt.