HERB - Digest format -- Question

[Katherine Blackthorne]

> Good Morning,
> 
>   Due to the volume of traffic growth already, I've added a digest
>   format of the herbalist list.
> 
>   To change you can eithe ruse the web page at:
> 
> http://www.ansteorra.org/lists.html
> 
>   or send mail to majordomo at ansteorra.org with the message body of
>   "subscribe herbalist-digest".
> 
>   If you subscribe to this list, remember to unsubscribe from the main
list.
> 
> In Service,
> 
> -- 
> Phelim "Pug" Gervase  |  "The problem's plain to see
> Barony of Bryn Gwlad  |   Too much technology."
> House Flaming Dog     |   
> pug at pug.net           |   --Styx

Forgive my ignorance.  What is a "digest format"?  
Katherine Blackthorne
Province of Golden Rivers
Principality of Cynagua
Kingdom of the West
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