SSL/TLS Certificate installed on the website means it helps to secure the data transferred between the visitor and a website and vice-versa. Though one thing has to be noted that, it doesn’t mean the information on the server is secured, as once the sensitive data reaches the server it’s up to the admin on how to keep it safe for example, encryption of database. In other words, HTTPS means HTTP is sent over an SSL encrypted connection which covers GET & POST with other HTTP actions while keeping it safe and unaltered as all the data is passed via an SSL tunnel to the client browser.!
The wildcard applies to the Alpha, Domain, and Organisation SSL certificates. The certificates are issued for the domain name specified in the initial application. If you buy a wildcard with one of these three certificates, it means that the common name specified is *.yourdomainname.com. You can then use the certificate on an unlimited number of subdomains and servers. You also have the option to add in the future!
To complete the application for your SSL certificate you need to generate a CSR and submit it to our Certificate Authority (CA). The CSR contains text that's been encrypted and includes details of your application: company name, domain name, location, email address. Plus, your public and private keys will be generated. Your public/private keys are for encrypting/decrypting all online communication and transactions between you and your customers. To ensure your website traffic stays secure, you must keep your private key a secret. Once our CA receives and confirms your details, it will issue your SSL certificate.