I have multiple domains and subdomains. Can I use Multi-Domain SSL? Will this certificate also be used for subdomains?

Yes. Multi-Domain SSL supports up to 100 different domain names and subdomains. Please note that a certificate can be used with 3 domain names at the base price. If you need to cover more domains, the price of the certificate will increase. Multi-Domain SSL certificates do not require multiple dedicated IP addresses for your host names.

Multi-Domain SSL activation is very convenient because you go through the activation process just once, whereas the activation of three single certificates is more convenient if the domains are located on different servers.