Everything you ever wanted to know about Wildcard SSL certificates (SSL certificate for subdomain).
Secure Sockets Layer (SSL) Certificates are crucial for all websites now, both from a security and a visibility standpoint. SSL Certificates serve as cryptographic measures to secure the data being transmitted over a computer network, between a client and server.
And as of last July, Google has also made it mandatory for all websites to carry an SSL certificate. Sites without SSL certificates are flagged as ‘Not Secure’, which can drastically hurt their traffic and prevent them from rising high in Google search results.