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Display advertising is advertising on web sites. It includes many different formats and contains items such as text, images, flash, video, and audio.〔(【引用サイトリンク】url=http://marketingland.com/library/display-advertising-news )〕 The main purpose of display advertising is to deliver general advertisements and brand messages to site visitors.〔(【引用サイトリンク】url=http://www.iabuk.net/disciplines/display-advertising/guide )〕 According to eMarketer, Facebook and Twitter will take 33% of display ad spending marketshare by 2017. Also, desktop display advertising has eclipsed search ad buying in 2014, with mobile ad spending to overtake display in 2015. ==History== Since the early '90s the advent of the Internet has completely changed the way people relate to advertisements. As computers prices decreased, online content became accessible to a large portion of the world's population.〔(【引用サイトリンク】url=http://www.iabuk.net/disciplines/display-advertising/guide )〕 This change has modified the way people are exposed to media and advertising and has led to the creation of online channels through which advertisements can reach users. The first type of relationship between a website and an advertiser was a straightforward, direct partnership. This partnership model implies that the advertiser promoting a product or service pays the website (also known as a publisher) directly for a certain amount of ad impressions. As time went on, publishers began creating thousands of websites, leading to millions of pages with unsold ad space. This gave rise to a new set of companies called Ad Networks.〔(【引用サイトリンク】url=https://www.youtube.com/watch?v=1C0n_9DOlwE )〕 The ad network acted as a broker, buying unsold ad space from multiple publishers and packaged them into audiences to be sold to advertisers. This second wave of advertiser-publisher relationships rapidly gained popularity as it was convenient and useful for buyers who often found themselves paying a lower price yet receiving enhanced targeting capabilities through ad networks. The third and most recent major development that shaped the advertiser-publisher ecosystem started occurring in the late 2000s when widespread adoption of RTB (real time bidding) technology took place. Also referred to as programmatic bidding, RTB allowed companies representing buyers and sellers to bid on the price to show an ad to a user every time a banner ad is loading. When a page loads during a user visit, there are thousands of bids occurring from advertisers to serve an ad to that user, based on each company's individual algorithms. With this most recent change in the industry, more and more ads are being sold on a single-impression basis, as opposed to in-bulk purchases. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Display advertising」の詳細全文を読む スポンサード リンク
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