The Data Link Layer is Layer 2 of the OSI model, responsible for node-to-node data transfer and error detection/correction.

Elaboration:

• Divided into two sublayers:
  1. Logical Link Control (LLC): Manages flow control and error checking.
  2. Media Access Control (MAC): Manages access to physical transmission media.
• Uses MAC addresses for device identification.
• Implements protocols like Ethernet (IEEE 802.3) and Wi-Fi (IEEE 802.11).

Example:

In Ethernet networks, the Data Link Layer ensures that data packets are sent to the correct MAC address within a LAN.