Proxy mesh ??

hello all i was just wondering what is a proxy mesh and what are they used for. If possible can you provide some links to a tutorial on this subject. Any help is helpful:yes::D:yes:

Proxy objects are just objects that stand in for another object.
An example of low res objects standing in for the final higher resolution objects during the development of Sintel can be seen in this video.
http://www.sintel.org/news/library-linking-asset-management/

thanks Richard