The modern age is an age of advertisements. Open a newspaper and you will find advertisements on every page. And the advertisements are about all sorts of things-situations vacant, situations wanted education, matrimony, notices, cinema shows, medical treatment, sale of houses and flats, nursing homes, dresses, fashions, tenders, meetings, and whatnot.
An advertisement is meant to attract the attention of the people (buyers). It is written in the shortest form possible mentioning only the important details, because of the cost of publishing it.