Hello
Below is my answer.
I will give you a simple explanation, but I think near the bottom is a better answer.
After you purchase a domain name, it has to be parked. This means if you visit your domain name, after you purchase your domain name, then you won't see your website, but instead you might see a web page provided by the domain name registrar. You can remove their web page from inside your domain name account after you have your website published on the Internet.
With all do respest, I think you have the wrong idea regarding what you said below.
Host-Site Domain: www.MySite.com
Add-on Domain: wwwm.MySite.com/AddOn
You are confusing your domain name with web hosting companies that offer dedicated servers.
Add-on domain means you have extra domain names, and you want to use your extra domain names with your web hosting.
For example:
www.man.com
www.woman.com
www.school.com
What I listed above are extra domain names you can use. Lets say you have one domain name, you should be able to add on more domain names with your one web hosting account. I think if you are looking at shared web hosting, then the shared web hosting company would have to offer this service, for you to acquire it.
According to the add-on domain answer that's below, the web hosting company can use more than one domain name with one server.
I am under the impression the web hosting company you are looking at is permitting their clients to use 10 different domain names with one web hosting account.
For example:
www.man.com
www.woman.com
www.school.com
www.friend.com
www.girl.com
www.boy.com
www.food.com
www.home.com
www.eyes.com
www.clothes.com
Only you will know if you want something, or not.
Host Site
A web hosting service is a type of Internet hosting service that allows individuals and organizations to make their website accessible via the World Wide Web. Web hosts are companies that provide space on a server owned or leased for use by clients, as well as providing Internet connectivity, typically in a data center. Web hosts can also provide data center space and connectivity to the Internet for other servers located in their data center, called colocation, also known as Housing in Latin America or France.
The scope of web hosting services varies greatly. The most basic is web page and small-scale file hosting, where files can be uploaded via File Transfer Protocol (FTP) or a Web interface. The files are usually delivered to the Web "as is" or with minimal processing.[1] Many Internet service providers (ISPs) offer this service free to subscribers. Individuals and organizations may also obtain Web page hosting from alternative service providers. Personal web site hosting is typically free, advertisement-sponsored, or inexpensive. Business web site hosting often has a higher expense depending upon the size and type of the website.
Single page hosting is generally sufficient for personal web pages. A complex site calls for a more comprehensive package that provides database support and application development platforms (e.g. PHP, Java, Ruby on Rails, ColdFusion, or ASP.NET). These facilities allow customers to write or install scripts for applications like forums and content management. Also, Secure Sockets Layer (SSL) is typically used for e-commerce.
The host may also provide an interface or control panel for managing the Web server and installing scripts, as well as other modules and service applications like e-mail. Some hosts specialize in certain software or services (e.g. e-commerce), which are commonly used by larger companies that outsource network infrastructure.
Add-On Domain
Virtual hosting is a method for hosting multiple domain names (with separate handling of each name) on a single server (or pool of servers). This allows one server to share its resources, such as memory and processor cycles, without requiring all services provided to use the same host name. The term virtual hosting is usually used in reference to web servers but the principles carry over to other internet services.
One widely used application is shared web hosting. Shared web hosting prices are lower than a dedicated web server because many customers can be hosted on a single server. It is also very common for a single entity to want to use multiple names on the same machine so that the names can reflect services offered rather than where those services happen to be hosted.
There are two main types of virtual hosting, name-based and IP-based. Name-based virtual hosting uses the host name presented by the client. This saves IP addresses and the associated administrative overhead but the protocol being served must supply the host name at an appropriate point. In particular, there are significant difficulties using name-based virtual hosting with SSL/TLS. IP-based virtual hosting uses a separate IP address for each host name, and it can be performed with any protocol but requires a dedicated IP address per domain name served. Port-based virtual hosting is also possible in principle but is rarely used in practice because it is unfriendly to users.The examples of which are VMS.
Name-based and IP-based virtual hosting can be combined: a server may have multiple IP addresses and serve multiple names on some or all of those IP addresses. This technique can be useful when using SSL/TLS with wildcard certificates. For example, if a server operator had two certificates, one for *.example.com and one for *.example.net, he could serve foo.example.com and bar.example.com off the same IP address but would need a separate IP address for baz.example.net.
Parked Domain
Domain parking refers to the registration of an internet domain name without that domain being associated with any services such as e-mail or a website. This may have been done with a view to reserving the domain name for future development, and to protect against the possibility of cybersquatting. Since the domain name registrar will have set name servers for the domain, the registrar or reseller potentially has use of the domain rather than the final registrant.
Domain parking can be classified as monetized and non-monetized. In the former, advertisements are shown to visitors and the domain is 'monetized'. In the latter, an "Under Construction" or a "Coming Soon" message may or may not be put up on the domain by the registrar or reseller. This is a single-page website that people see when they type the domain name or follow a link in a web browser. Domain names can be parked before a web site is ready for launching.