Press release submission involves sending a press release to one or more media outlets (like newspapers, TV and radio stations, news Web sites, etc.) for publication.
There are also many press release distribution Web sites out there that will take your press release and automatically have it published on many other Web sites across the Internet for you, in addition to publishing it on their own site. Many of these sites offer both free and paid options. Paid options provide you with many more features, such as allowing you to have a logo, photos, multiple links, and videos included with your press release.
Check out these press release distribution sites for more info and ideas:
www.prnewswire.com
www.prlog.org
www.prweb.com