Editing Advertising network (section)

==Overview==
{{Update|section|date=March 2014}}
The advertising network market is a large and growing market, with Internet advertising revenues expected to grow from $135.42 bn in 2014 to $239.87 bn in 2019.<ref name="http://www.pwc.com">{{cite web|url=http://www.pwc.com/gx/en/global-entertainment-media-outlook/segment-insights/internet-advertising.jhtml |title=Internet advertising: Key insights at a glance |publisher=[[PricewaterhouseCoopers]] |access-date=2015-07-30}}</ref>  Digital advertising revenues in the United States alone are set to reach $107.30 bn in 2018 which is an 18.7% increase from 2017 ad spend.<ref>{{Cite news|url=https://www.emarketer.com/content/digital-ad-spending-benchmarks-by-industry-2018|title=Digital Ad Spending Benchmarks by Industry 2018 - eMarketer|work=eMarketer|access-date=2018-07-17}}</ref> This growth will result in many new players in the market and encourage acquisitions of ad networks by larger companies that either enter the market or expand their market presence. Currently, there are hundreds of ad networks worldwide and the landscape changes daily.

The inventory of online advertising space comes in many different forms, including space on the desktop and mobile websites, in [[RSS|RSS feeds]], blogs, instant messaging applications, [[mobile app]]s, [[adware]], e-mails, and other media. The dominant forms of inventory include third-party content websites, which work with advertising networks for either a share of the ad revenues or a fee, as well as [[search engine]]s, mobile, and online video resources.<ref name="http://www.pwc.com"/>

An advertiser can buy a [[run of network]] package, or a run of category package within the network. The advertising network serves advertisements from its [[central ad server]], which responds to a site once a page is called. A snippet of code is called from the ad server, that represents the advertising banner.

Large publishers often sell only their remnant [[Advertising inventory|inventory]] through ad networks. Typical numbers range from 10% to 60% of total inventory being remnant and sold through advertising networks.

Smaller publishers often sell all of their inventory through ad networks. One type of ''ad network'', known as a ''blind network'', is such that advertisers place ads, but do not know the exact places where their ads are being placed.