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In the application of statistics to advertising and media analysis, reach is defined as the size of the audience who listen to, read, view or otherwise access a particular work in a given time period. Reach may be stated either as an absolute number, or as a fraction of a population.
For any given viewer, they have "reached" the work if they have viewed it at all during the specified time period. Multiple viewings by a single member of the audience in the cited time period do not increase reach.
Since reach is a time-dependent summary of aggregate audience behavior, reach figures are meaningless without a time period associated with them: an example of a valid reach figure would be to state that "[example website] had a one-day reach of 1565 per million on 21 March 2004".
Reach is also the name of the eGovernment agency of the government of Ireland.
REACH is the Registration, Evaluation and Authorisation of CHemicals framework for regulation of chemicals in the European Union.
REACH is also a brand of toothbrushes, dental floss, and other oral care products manufactured by McNeil-PPC, a division of Johnson & Johnson Corporation.
REACH is also the name of the Spartan 2 project Homeworld from the Halo Video Game Series. This is where the Master Chief had originated from at the start of Halo 1.
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