Data Link Layer

The Data Link Layer is the second layer of the OSI model, which helps devices communicate over a physical connection. It ensures that data is correctly transferred between two connected devices by packaging it into frames, adding addressing information, and checking for errors. Think of it like a postal service: it organizes your letters, labels them with addresses, and checks that they arrive without damage. This layer plays a crucial role in local networks, like Wi-Fi and Ethernet, ensuring reliable communication within a limited area before passing data up to higher layers for further processing.