The domain is basically the base URL. It is the site name that you would register. A site sits on a server known by its IP address, and a domain gives that a name. You could technically use a site without a name, but you would have to know the IP address, and if the IP frequently changes, you would be out of luck.
A website domain is traditionally known as the name or URL of a website
A domain host functions as a host for your website. For example if you want a website for your company, you will require a domain host in order to set up a domain for your website. Often you can purchase a domain name that matches the name of your company.
A domain you customise I would gather. Most likely it is meant that you choose the name of the domain... "CUSTOM"
GoDaddy is one website that checks the availability of domain names online. One can sign up on this website and they will inform you whether a domain name is available.
Google itself is the domain site of the website.
You need both for online presence of your business. Domain name is just like the address/location of your business on the web. When we type your domain name on our browser, it goes to your website. Website is more of a group of files that you show to your online visitors. You have a domain name but no website - what's the purpose of having your domain name? You have a website but no domain name - how can people see your website? The two things need to go together for online presence of your business.
You can test a domain by going to the website or asking other people to view your website. There are also companies that will test the website for you, for a fee.
You can get CA domain registration from the GoDaddy website. Once on the website, hover over "Products" and then "Domains" in the top navigation menu and click on "Domain name registration." You can then select the CA domain in the drop-down box to register your domain.
Usually, the domain selling website will have a availability check handy at the time of the domain purchase. Or you can simply type your desired domain into the address bar to see if a website comes up. If it does, then the domain is taken.
Usually the person or company who purchased the domain name that is used to access the website. Without a domain name a website is not accessible from the internet. You can also specify who the owner is when purchasing the domain name.
In computer terms "domain" is a custom named web address created by the user that redirects internet traffic to a pre specified web address. Domain names are a nice way to hide long web addresses and make a nice finish to ones website.
One could purchase an Australian website domain on a domain website such as 123reg, Netregistry, Domainregistration, Austdomains, Crazydomains and Melbourneit.