Have you got even the foggiest idea what HTTPS is?
Neither have lots of other people who use the web, but it's very important.
In a nutshell, it's a method of ensuring that any data you type into your browser, such as form information, emails, stuff like that, is sent to the website in a nice and secure manner that is hard for bad guys to intercept.
For example, if you're typing in a password to access a website in your local cafe, and that website doesn't have HTTPS installed, somebody can intercept it and get access to your password.
Really easily, too. A simple plugin for FireFox will sit there ‘sniffing' for un-encrypted connections and list them all.
Why does this matter? It's not my website!!!
Do you use the same password for multiple sites? Well then, that's the problem.
People can sniff your password as you'r accessing non-secure websites and then use them on secure ones, like banks and stuff.
This is why most sites are moving to HTTPS and why Google thinks they should warn people when a site isn't secure.
Google cares enough to now put a warning in their Chrome browser so if someone is browsing a website that doesn't use HTTPS, it'll show “NOT SECURE” next to the web address.
It's true that many people won't notice, but as awareness grows, many people are taking more heed of these warnings and they'll simply go away thinking that you don't care one jot about their security.
How can I check?
When you go to your website, you should get a padlock next to the web address. Clicking on that will give you information about the security (or lack of) employed by the site.
Or, you can go here: https://www.whynopadlock.com/
Type your web address in and see what it says.
How do I fix it?
You need to install SSL on your server and configure your website to use it, or ask your host to do it. Let's face it, asking someone else is the easiest method, and it means you don't need to worry yourself.
It's not hard, takes about half an hour if there's a bunch of configuration to do, and when it's done you can forget about it.
So ask your host now, get it done, and light up the BBQ.
Oh, and do it quickly, D-Day is tomorrow.
And you thought GDPR was a deadline, eh?