Network interfaces are essential for communication between devices and systems. This article explores key concepts like `localhost`, loopback addresses, and local networking. It explains how different Network Interface Cards (NICs)—virtual, wired, and wireless—facilitate connectivity. It also clarifies how `localhost` maps to loopback IPs (`127.0.0.1` for IPv4, `::1` for IPv6) and how local networking works within a system. To dive deeper into these fundamentals and their practical applications, read the full article https://leapcell.io/blog/a-deep-dive-into-network-interfaces