Advertising
Advertising is an audio or visual form of marketing communication that employs an openly sponsored, non-personal message to promote or sell a product, service or idea. Sponsors of advertising are typically businesses wishing to promote their products or services. Advertising is differentiated from public relations in that an advertiser pays for and has control over the message. It differs from personal selling in that the message is non-personal, i.e., not directed to a particular individual. Advertising is communicated through various mass media, including traditional media such as newspapers, magazines, television, radio, outdoor advertising or direct mail; and new media such as search results, blogs, social media, websites or text messages. The actual presentation of the message in a medium is referred to as an advertisement or "ad" for short.
Marketing
Marketing is the study and management of exchange relationships. Marketing is used to create, keep and satisfy the customer. With the customer as the focus of its activities, it can be concluded that Marketing is one of the premier components of Business Management - the other being innovation.
Marketing Communications
Marketing communications (MC, marcom(s), marcomm(s)) uses different marketing channels and tools in combination: Marketing communication channels focuses on any way a business communicates a message to its desired market, or the market in general. A marketing communication tool can be anything from: advertising, personal selling, direct marketing, sponsorship, communication, promotion and public relations.
Advertising
Half the money I spend on advertising is wasted, and the trouble is I don't know which half.
John Wanamaker. Quoted in David Ogilvy's Confessions of an Advertising Man, Ch. 3, 1963. [Wanamaker here paraphrasing the 1st Lord Leverhulme].
Marketing
The future of marketing belongs to honest information, accurate data and clear claims based on truth.
Patrick Dixon Building a Better Business (2005)
Marketing
By the way, if anyone here is in advertising or marketing...kill yourself...you're the ruiner of all things good...you are Satan's spawn, filling the world with bile and garbage...kill yourself.
Bill Hicks (1961 - 1994), "Revelations" (1992)