Chat line ads

Commercial online service Prodigy displayed banners at the bottom of the screen to promote Sears products.

The first clickable web ad was sold by Global Network Navigator in 1993 to a Silicon Valley law firm.

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In early days of the Internet, online advertising was mostly prohibited.

For example, two of the predecessor networks to the Internet, ARPANET and NSFNet, had "acceptable use policies" that banned network "use for commercial activities by for-profit institutions".

Like other advertising media, online advertising frequently involves both a publisher, who integrates advertisements into its online content, and an advertiser, who provides the advertisements to be displayed on the publisher's content.

Other potential participants include advertising agencies who help generate and place the ad copy, an ad server which technologically delivers the ad and tracks statistics, and advertising affiliates who do independent promotional work for the advertiser.

Display advertising conveys its advertising message visually using text, logos, animations, videos, photographs, or other graphics.

Display advertisers frequently target users with particular traits to increase the ads' effect.

He also started the Direct Email Marketing Association to help stop unwanted email and prevent spam.

Online banner advertising began in the early 1990s as page owners sought additional revenue streams to support their content.

Online advertisers (typically through their ad servers) often use cookies, which are unique identifiers of specific computers, to decide which ads to serve to a particular consumer.

Cookies can track whether a user left a page without buying anything, so the advertiser can later retarget the user with ads from the site the user visited.

As advertisers collect data across multiple external websites about a user's online activity, they can create a detailed profile of the user's interests to deliver even more targeted advertising.

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