Earlier this month, I was chatting with a colleague who’s just starting her journey with SAP SD and Transportation Management modules; and she is enthusiast.

As we talked about how logistics flows work—orders, deliveries, routing—I realized:
Internet works in exactly the same way.

Every time you send an email, open a website, or stream a video, you’re shipping a digital package across the world. And behind the scenes, there’s a full delivery chain making it happen. It’s called the TCP/IP stack—but don’t worry, this isn’t a technical deep dive. It’s just logistics.

What Happens When You Click “Send”?

• Application Layer
  You write the message and pack it up. Like preparing your shipment.
• Transport Layer
  You choose how to send it: slow but secure (TCP), or fast and low-cost (UDP).
• Internet Layer
  The system finds the best route using the address (IP). Think global routing hubs.
• Data Link Layer
  A local courier picks it up—just like your router or switch.
• Physical Layer
  Cables, radio waves, and fiber physically move it. That’s your truck, plane, or van.

From Your Screen to the World

Billions of digital packages move every second, across invisible roads, through routers and switches, to reach the right destination in milliseconds.

You don’t see it. But it’s there. And it’s brilliant.