The easiest explanation is this. When you sign up for your blog, you get a url with the blog name imbedded in it. For example, http://coffeeshopbloggers.blogspot.com
You might not want the "blogspot" in your url, right? It makes your url longer and harder to remember. You are not so concerned about promoting blogspot/blogger as you are about promoting http://coffeeshopbloggers.com.
So mapping replaces the first url with blogspot or wordpress in it, to the one without it.
How to Do it?
Wordpress. You pay $10 ( if you already own the domain and $15 if you buy through Wordpress and now want to map) and repoint the domain name servers from the place you bought your domain name to wordpress.
From their website:
The Domain Mapping Upgrade allows you to use a custom domain name such as example.com instead of the standard WordPress.com domain name – example.wordpress.com – for your blog. This is a paid upgrade.
- Domain name registration + domain mapping costs $14.97 per year, per domain.
- Domain mapping for a domain (or subdomain) you already own costs $9.97 per year, per domain.
This is the url for How To Do Domain Mapping:
If you bought your url from go daddy, you would log into your account and go to domain management. Then you'd change the DNS servers to Wordpress Servers:
It takes about 24 hours for it to go into effect.
Blogger/Bloggspot. Different process. You change the cname and the aname.
Here is the url for the specific instructions by hosting companies:
Here's the Go Daddy! instructions because that is what I used: