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Ad blocking or ad filtering is removing or altering advertising content in a webpage. Advertising can exist in a variety of forms including pictures, animations, embedded audio and video, text, or pop-up windows and can employ autoplay of audio and video. All browsers offer some solution to the problem, either by targeting technologies (Adobe Flash/Shockwave, Windows Media Audio files, etc.) that are used to deliver ads, targeting URLs that are the source of ads, or targeting behavioural characteristic of ads (such as the use of HTML5 autoplay of both audio and video). == Benefits == To users, the benefits of ad blocking include quicker loading and cleaner looking Web pages free from advertisements, lower resource waste (bandwidth, CPU, memory, etc.), and privacy benefits gained through the exclusion of the tracking and profiling systems of ad delivery platforms. Blocking ads can also save substantial amounts of energy.〔http://research.microsoft.com/en-us/people/mzh/eurosys-2012.pdf〕 Another important aspect is improving security; according to some research, online advertising subjects users to a higher risk of infecting their devices than surfing porn sites.〔(【引用サイトリンク】title=Online Advertising More Likely to Spread Malware Than Porn )〕 In a high-profile case malware was distributed through advertisements provided to YouTube by a malicious customer of Google's Doubleclick.〔(【引用サイトリンク】title=YouTube angeblich als Virenschleuder missbraucht )〕〔(【引用サイトリンク】title=The Wild Wild Web: YouTube ads serving malware )〕 In August 2015, a 0-day exploit in Firefox browser was discovered in an advertisement on a website.〔(【引用サイトリンク】title=Firefox exploit found in the wild )〕 Users who pay for total transferred bandwidth ("capped" or pay-for-usage connections) including most mobile users worldwide, have a direct financial benefit from filtering an ad before it is loaded. Streaming audio and video, even if they are not presented to the user interface, can rapidly consume gigabytes of transfer especially on a faster 4G connection. In Canada, where users without a data plan often pay C$0.50/megabyte ($500/gigabyte) for at least the first 50-100MB exceeding their data allowance, the cost of tolerating ads can be quite high. Even fixed connections are often subject to usage limits, especially the faster connections (100Mbit/s and up) which can quickly saturate a network if filled by streaming media. It is a known problem with most web browsers, including Firefox, that restoring sessions often plays multiple embedded ads at once. Using an advertisement blocker stops such behaviour. 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「Ad blocking」の詳細全文を読む スポンサード リンク
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