๐Ÿ”’ Let's Encrypt supports Wildcard Certificates

A bit delayed but finally you can get a free wildcard certificate for a domain. :smiley:

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So, whatโ€™s it for?

For creating encrypted connections between web server and browser.

Check out the Wikipedia article.

Canโ€™t you just use OpenSSL?

Yes you can use any ssl library to create a self signed certificate. But you will get annoying warnings from the browser.

This is to get a certificate that is trusted by all major browsers, so you get that green lock in the url bar in the browser.