What is a mapper class ?

what is a mapper class?
it looks like it maps to something ...right ?
can you provide some example ? this concept is not clear.
N.B :
I am giving you some context where i have come accross this term ....i have noticed this , where there are some messaging (JMS,MQ etc ) involved in applications........if the application have messaging , then the project usually contain some mapper kind of class......yes, i know this is not a full information that i can give you...........the point is , have you seen this kind of mapper classes in your project ? what they do ? can you give some outline view what it does basically ......i am interested in this terminology.

Thanks for the response.
The "mapper" classes do you usually convert/map from
one format to another by mapping values. you told "format".
uhh....ok....suppose i have a XML message(complient to XSD1) which lies in JMS queue(suppose) ....does a Mapper class tears this XML message and then again build another XML Message (complient to XSD2) ......is it like this ? is it the job of a mapper class ? does it simply makes a new different format from a given format ?
E.g. data
from your model should be mapped into fields in a
predefined message format.ahh....so, if i have a javabean(data model) with many properties then a mapper class takes these properties and puts these in the appropriate fields of a predefined message format.
anything else involved here ?
In fact , i was looking for mapper classes who are involved in messaging
Kaj

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