When you visit a website chances are that you are being tracked. Most of this tracking is related to online advertising, as advertising networks attempt to assign their respective users a unique identifier and display targeted advertisements based on their browsing history. In theory, targeted advertising based on the websites that a user has previously visited has a greater chance of converting them into customers. 

Up until the most recent Chrome release, the browser had four different security badges it displayed in the URL bar: secure HTTPS, HTTP, HTTPS with minor errors and Broken HTTPS. Starting with the latest Chrome release, version 46, the yellow caution triangle indicating HTTPS with minor errors will be removed to simplify the system of security badges. This state will now marked with the same page icon as standard HTTP pages.