Thank you Jon. This is really helpful. :)

>What is an Xref?
>An Xref is an External Reference. Basically you can have a "dwg" that has an xref of another drawing, you can see the xref'd "dwg" but it's stored in its on file.
>
>Why do we use Xref?
>I usually use them to reduce file size and for easier Maintenance. Update the xref'd file and all the "dwg's" that point to it are updated
>
>What is the best situation to use an Xref?
>You'll have to make that call :)