Every time you open your browser and visit a website, something extraordinary happens in the background. Before you even see the first pixel of a webpage load, your browser has already had a silent conversation with that website’s server, verified its identity, and decided whether or not it is safe to proceed. This entire process happens in milliseconds, and most people never think about it. But without it, the internet as we know it simply could not function safely.

At the heart of this invisible system is an organization type that most internet users have never heard of, yet interact with dozens of times every single day. That organization is called a Certificate Authority, and it plays one of the most important roles in keeping the internet trustworthy, secure, and functional for billions of people around the world.