In computer software, horizontal market software is application software that is useful in a wide range of industries. This is the opposite of vertical market software, which has a scope of usefulness limited to few industries. Horizontal market software is also known as "productivity software." Examples of horizontal market software include word processors, web browsers, spreadsheet applications, and generic bookkeeping applications. Since horizontal market software is developed to be used by a broad audience, is generally lacks any market-specific customizations.
References
Horizontal market software Wikipedia(Text) CC BY-SA