Whether you’re working in cybersecurity or acting as your own tech support at home, you’ve probably heard about firewalls. A properly configured firewall acts like a fastidious border guard, making all the little data packets show their credentials before they can enter the country - er, the computer. In this episode, we’ll learn about the history of firewalls (including where that name came from), how they work, and how they’ve adapted from the days of big hair to the era of big data.