A commercial solicitation designed to sell some commodity, service or similar.
Companies try to sell their products using advertisements in form of placards, television spots and print publications.
A public notice.
The city council placed an advertisement in the local newspaper to inform its residents of the forthcoming roadworks.
A recommendation of a particular product, service or person.
The good manners and intelligence of the students are an advertisement for the school.
Notoriety.
In gin rummy, the discarding of a card of one's preferred suit so as to mislead the opponent into thinking you do not want it.