Your JimdoPro account includes one domain name, and JimdoBusiness accounts include two (for example, www.yourname.com). Please note: With JimdoBusiness you have one website, but two domain names through which it can be accessed. If you already own your domain name, you can certainly use it with your Jimdo site - find out more here. You can also order additional domains for your JimdoPro and JimdoBusiness sites.
Here's a list with prices and types of domains you can add.
Why is having your own domain name so important? It's simple: a custom domain name is your permanent address on the Internet. It's the foundation of a successful and professional web presence -- in short, your personal billboard.