When you publish your website, you are always a bit concerned about its security of it. From a security point of view, an SSL certificate plays a major role to authenticate the identity of the website. SSL stands for Secure Socket Layer, which creates a secure tunnel between the web server and the client browser to keep online transactions private. In another way, it prevents hackers from reading or modifying information transferred between two systems. It is always recommended to check the padlock next to the website you are visiting. If it exists means visiting the website is secure to connect.
I wrote another article on SSL certificates. This article describes how to get a free SSL certificate by using Window Server CA. You can use this for internal communication in a lower environment.