A slogan is a memorable motto
A motto is a phrase meant to formally summarize the general motivation or intention of a social group or organization. A motto may be in any language, but Latin is the most used. The local language is usual in the mottoes of governments...

 or phrase
In everyday speech, a phrase may refer to any group of words. In linguistics, a phrase is a group of words which form a constituent and so function as a single unit in the syntax of a sentence. A phrase is lower on the grammatical hierarchy than a clause....

 used in a political, commercial
Advertising slogan
Advertising slogans are short, often memorable phrases used in advertising campaigns. They are claimed to be the most effective means of drawing attention to one or more aspects of a product. A strapline is a British term used as a secondary sentence attached to a brand name...

, religious and other context as a repetitive expression of an idea or purpose. The word slogan is derived from slogorn which was an Anglicisation
Anglicisation, or anglicization , is the process of converting verbal or written elements of any other language into a form that is more comprehensible to an English speaker, or, more generally, of altering something such that it becomes English in form or character.The term most often refers to...

 of the Scottish Gaelic sluagh-ghairm (sluagh "army", "host" + gairm "cry"). Slogans vary from the written and the visual to the chanted and the vulgar. Often their simple rhetorical nature leaves little room for detail, and as such they serve perhaps more as a social expression of unified purpose, rather than a projection for an intended audience.

Marketing slogans are often called taglines in the United States or straplines in the U.K. Europeans use the terms baselines, signatures, claims or pay-offs.
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