A wildcard certificate allows an organization to secure a domain and all of its subdomains with a single certificate. This is achieved by using an asterisk (*) in the domain name portion of the certificate, representing all possible subdomains. Self-signed certificates are generated by the owner and are not trusted by default by browsers and operating systems. Extended Validation (EV) certificates provide higher levels of trust through a rigorous authentication process but do not inherently support multiple subdomains. Root certificates are used to sign other certificates in a certificate hierarchy but are not used to secure specific domains or subdomains.
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What is a wildcard certificate and how does it work?
What are the differences between a wildcard certificate and other types of certificates?
Why are self-signed certificates not trusted by default?