Shared SSL & Wildcard SSL
It is possible for a web hosting company to share a single SSL certificate - this allows the same SSL certificate to be used by many websites without the need to issue individual SSL certificates to each hosting customer. The recommended way to share SSL is to use a Wildcard SSL certificate. This allows the unlimited use of different subdomains on the same domain name. The Wildcard certificate allows the webhosting company to give each customer a secure subdomain, such as customer1.webhost.com, customer2.webhost.com, etc. The same can be applied for organizations wanting to secure multiple subdomains within the enterprise network.