As an informal noun, an advert refers to an advertisement. To advertise means to publicize propaganda that promotes products or establishments. An advertiser is a person or object that advertises something. An advertisement is a form of promotion of a product. A product is a manufactured substance that is put on sale. A brand is a variant of a product manufactured under a certain company. A commercial is often referred to as a visual advertisement of a product. A billboard is a visionary representation of propaganda for a product. A periodical is a magazine, newspaper, or journal published to inform one of a product. An agency is a business or organization established to provide a service.