As of this month, fom July 1st 2018, Google will start displaying websites as 'non-secure' - if your website does not have an SSL Certificate applied to your website.
To find out more about this topic - read more here.
What is an SSL Certificate you might say?
When a SSL certificate is installed on a web server, it activates the padlock and the https protocol to allows secure connections from a web server to a browser. Typically, SSL is used to secure credit card transactions, data transfers and logins, and more recently it is becoming the norm when securing the browsing of social media sites.
Back in 2017, Google started to 'prefer' websites that had SSL Certificates - even if your site wasn't e-commerce - as a way to increase SEO (Search Engine Optimisation). This practise continues today.