Firstly, What Is SSL And HTTPS?
A Secure Sockets Layer (SSL) Certificate, or Top Layer Security (TLS), is a secure protocol that works on top of regular HTTP to provide security. It does this by creating a secure encryption key, or code, between your browser and the web server. This prevents your personal information and data from being intercepted by any computer in-between.
An SSL Certificate stores the name of the holder, as well as issuing authority, with a unique serial number. This acts as your ID card on the web, and allows users / servers to know that you are indeed who you say you are.
Hyper Text Transfer Protocol Secure (HTTPS) is, as the name suggests, the secure version of unencrypted HTTP, which makes use of with SSL/TLS to deliver secure data.
With the release of Chrome 62 in late 2017, Google issued an update that now requires any website with a text input to have an HTTPS connection.