From Raw Signals to Organized Communication In the previous article, we explored the Physical Layer, where data exists as electrical signals, light pulses, or radio waves. Those signals can travel between devices, but there's a problem: Signals alone don't tell us who should receive the data. A network needs a way to identify devices and organize communication. That's exactly what the Data Link Layer (Layer 2) does. Layer 2 takes the raw bits delivered by the Physical Layer and transforms them i