Beside using subdomains, another way of creating different URL for your domain and organizing files on your server is by using domain directory, also known as domain folder.
Web pages file under a domain directory (eg: xyz) can be accessed by putting it as a suffix on a main domain name as below:
Unlike main domain and subdomain, domain directory is CASE SENSITVE. So, keying in URL name www.yourdomain.com/xyz is DIFFERENT then www.yourdomain.com/xYz
Domain directory is created directly from FTP software such as FileZilla. Below tutorial shows the detail steps: