Let's Encrypt: Free Certificates

HTTP/2 is a significant improvement over current HTTP/1.1,
and it practically requires SSL/TLS (since all current web browsers require it)
Using encryption also help  Google search rankings.
Getting signed certificates was so far complicated and expensive,
and now there is a free service that provides valid certificates.

Let's Encrypt
"Let’s Encrypt is a new Certificate Authority: It’s free, automated, and open. In Public Beta"

"Let’s Encrypt has entered Public Beta. Invitations are no longer needed in order to get free certificates from Let’s Encrypt."

How It Works

"No validation emails, no complicated configuration editing, no expired certificates breaking your website. And of course, because Let’s Encrypt provides certificates for free, no need to arrange payment."

Mozilla, EFF, Cisco back free-as-in-FREE-BEER SSL cert authority • The Register