A subdomain is just as it sounds, a sub or second-level of a domain. It’s a great way to create memorable web addresses for various areas of your site. For example, your site is www.mysite.com. A subdomain would be music.mysite.com, and another would be funstuff.mysite.com.
WebHosting UK provides hosting for main domain name as well as sub-domains. There is no restriction on the number of sub-domains, you can create and host multiple sub-domains under one web hosting account.