Press release is a great way to build your brand value as well as creating quality backlinks from authority sites as well as improve the search engine ranking of your sites. Just search on google for press release help, you will get hundreds of free tips.
http://forums.digitalpoint.com/showthread.php?t=2381258#post17236259 That is a link to a post I recently made as a response to another user's inquiry about Press Releases. It has a video included that give a quick explanation.
Press Release is like a news type..its very good way to spread your site, its good for backlink in google as well. Prlog is one of the nice press release site, which is free...
press release is an online publicity that gives you the advantage to have more traffic to your website and to recognize your brand to gain more credibility.
In my opinion press release is pseudo-news story, written in third person, that seeks to demonstrate to an editor and also reporter the newsworthiness of a exacting person, service, event or product.It is often sent by yourself, by email, fax or snail mail. They can also be part of a full press kit, or may be accompanied by a pitch letter.