What is a Subdomain?
It is, as the name would suggest, an additional section of your main domain name. You create them to help organize and navigate to different sections of your main website. Within your main domain, you can have as many as necessary to get to all of the different pages of your website.
What are they used for?
It is commonly used to logically separate a website into sections. You can use a subdomain to launch a career site (careers.yoursite.com), a forum (forum.yoursite.com) or for customer support (support.yoursite.com). You may use subdomains to create blogs of different themes too. For instance, sbnation.com is a sports news blog. However, it uses blogs like weaintgotnohistory.sbnation.com and theshortfuse.sbnation.com for specific teams on different subdomains.
Some other uses :
- Create different language versions of a website (en.yoursite.com).
- Create a mobile version of a website (m.yoursite.com).
- Set up a network of unrelated sites. For example, how you can sign up for a WordPress.com account and create your own blog on a subdomain (yourblog.wordpress.com).
You can get creative with them. You may point them to a section or a single page on your website too.
For example, if you have a personal portfolio site, you could host your contact form at hireme.yourname.com.
What is a wildcard subdomain?
A wildcard is basically a “catch-all” subdomain. It lets you create tons of them without having to manually set up each one.
For example, if you wanted to create a WordPress multisite network, you could use a wildcard subdomain so that each network site can get its own (like WordPress.com).
A wildcard one is represented by an asterisk. For example,