An SSL certificate serves to provide security to the visitor of your website, a way to tell your customers that the site is authentic, real and reliable to enter personal data. The acronym SSL responds to the terms in English (Secure Socket Layer), which is a security protocol that makes your data travel in an integral and secure way, that is, the transmission of data between a server and a web user, and in feedback, it is fully encrypted or encrypted. The fact that the data travel encrypted, we refer to that mathematical algorithms are used and a system of keys that are only identified between the person who navigates and the server. By having a reliable SSL certificate, the data is encrypted, at which point we can ensure that nobody can read its content. All this leads us to understand that the technology provided by an SSL certificate is the secure transmission of information through the Internet, and thus confirm that the data is free of unwanted people.
Wildcard SSL certificates protect the URL of your website, as well as an unlimited number of its subdomains. For example, an individual Wildcard certificate can protect www.example.com, blog.example.com, and store.example.com.
Yes, you can contract an SSL certificate to protect a specific subdomain. It is not necessary to contract a certificate to protect the main domain and then hire a certificate for the subdomain.