Hold: This function just registers a domain name with us and holds it for later use on an account here or for any other use on the internet. You may use a held domain at any time, just ask.
Park: Parking is placing another domain name on top of another domain, or overlapping. This allows you to point multiple domains to the same website account.
Map: Mapping allows you to point another domain name to any directory in your website account. You can use this to create multiple distinct websites in only one account.