A Share of Voice is a brand's or group of brands' advertising weight expressed as a percentage of a defined total market or market segment

Market segment

Market segmentation is a concept in economics and marketing. A market segment is a sub-set of a market made up of people or organizations with one or more characteristics that cause them to demand similar product and/or services based on qualities of those products such as price or function...

 in a given time period. The weight is usually defined in terms of expenditure, ratings, pages, poster sites etc.

In the online advertising

Online advertising

Online advertising is a form of promotion that uses the Internet and World Wide Web to deliver marketing messages to attract customers. Examples of online advertising include contextual ads on search engine results pages, banner ads, blogs, Rich Media Ads, Social network advertising, interstitial...

industry, share of voice is used to "represent the relative portion of ad inventory available to a single advertiser within a defined market over a specified time period."

External links

• http://www.abc.net.au/corp/pubs/monitoring_elections.htm
• http://www.nitb.com/article.aspx?ArticleID=1263
• Social Media Share of Voice Example
• http://www.clickz.com/clickz/column/1936286/-optimized-search-synergy-seo-ppc-2011/ Search Engine Marketing Building Share of Voice Across Engines