SSL certificates, short for Secure Socket Layer, were developed by Netscape to secure online transactions between web servers and web browsers. SSL certificates can help protect an online user's banking details, login credentials, email addresses, and other confidential information with first-rate encryption strength, keeping it nice and secure and away from the ruthless eyes of hackers.
Have you ever wanted to view an RSS or ATOM feed in a web based feed reader such as Google Reader or Bloglines, but could not because the feed required user authentication or used an invalid SSL certificate?
'Let's Encrypt is a free, automated, and open certificate authority (CA), run for the public's benefit. Let's Encrypt is a service provided by the Internet Security Research Group (ISRG).'