https://www.cnet.com/news/chrome-warns-of-not-secure-sites-to-cut-web-surveillance-tampering-faq/

The Hypertext Transfer Protocol lets your web browser fetch a web page from the server that hosts it. HTTP has had a good run, but it has a problem: It doesn't protect communications with encryption that blocks eavesdropping and tampering.

That's why Google, Mozilla and other tech industry allies have been pushing websites everywhere to switch to the secure version called HTTPS. And it's why, starting with the release of Chrome 68 on Tuesday, Google's browser will warn you whenever it loads an unencrypted website with HTTP.