In computing, locale is a set of parameters that defines the user's language, country and any special variant preferences that the user wants to see in their user interface. Usually a locale identifier consists of at least a language identifier and a region identifier.
Examples of variable output controlled by a locale is whether a date is displayed as 25/12/2012 or 12/25/2012 or some other format, and whether a decimal number is displayed as 123,456.78 or 123.456,78