A magalog is a promotional copy of a magazine, usually in a 12-page catalog format. The name is a portmanteau of "magazine" and "catalog" and was coined by Gary Bencivenga. Magalogs help introduce magazines to new readers. It can also help existing readers see new or upcoming changes, additions, or improvements to the magazine. An alternate use can include catalogs that are presented with content, not just advertising.
It was invented by Jim Rutz and Ed Elliott.
References
Magalog Wikipedia(Text) CC BY-SA