GeoTrust RapidSSL Wildcard certificate validates only a domain name and has a simplified validation procedure. It is recommended for individuals and sole traders.
Key feature of this certificate is that it protects any number of subdomains of the same level. This certificate is recommended for entrepreneurs with a lot of online projects on the same domain, for services requiring user registration, for authentication data protection, and for individuals wishing to protect information transferred through mail protocols.
When you order a certificate for *.domain.com, it will protect domain.com.