If you do not have a ‘Secure’ server, Google will flag your site with a ‘Not Secure’ warning sign! It is therefore mandatory to ensure that you install a Secure Certificate and your site has an https:// address.
In the latest release of Chrome, when a user enters data on an HTTP page, Chrome will mark the page as “Not Secure” with a label in the address bar. This label will also be shown in Incognito Mode for all HTTP pages.