A periodical collection of messages which have been posted to a newsgroupORmailing list. A digest is prepared by a moderatOR who selects articles from the group OR list, fORmats them and adds a contents list. The digest is then either mailed to an alternative mailing listOR posted to an alternative newsgroup. Some news readers and electronic mail programs provide commands to "undigestify" a digest, i.e. to split it up into individual articles which may then be read and saved OR discarded separately.