Ezines are newsletters or short magazines that are sent by e-mail. They have two formats - html or text. Text ezines are just that - all they contain is text. Html ezines, like web pages, contain html formatting and graphics, and often contain pictures or banners.
Many web sites run ezines.
These are usually free to subscribers. Many are advertiser-supported, and even those that aren't usually include ads, which increase the circulation of the ezine. You don't have to change the subject or message - just send it. If the site keeps archives, take a look first to see if their ezine will be of interest to you. Newbie Club Insider is jargon-free, and each issue has lots of useful help.