Shared SSL will be something without your domain name. As an example it's generally servername.somedomain.com such as atlas.mddhosting.com.

Where as regular SSL will be something of your choosing, either www.yourdomain.com or secure.yourdomain.com or somethingofyourchoosing.yourdomain.com or even just yourdomain.com (no www.)

You can get a RapidSSL for around $12~14/year which is not bad from NameCheap.com.