A MAC Address (Media Access Control Address) is a unique identifier assigned to network interfaces for communications on a physical network. It consists of six pairs of hexadecimal digits, typically displayed in a format like 00:1A:2B:3C:4D:5E. This address helps devices identify and communicate with each other within a local area network (LAN). Each MAC Address is hardcoded into the network interface card (NIC) of a device, ensuring that no two devices on the same network have the same address. This uniqueness is crucial for network management and security, allowing routers and switches to direct data packets accurately to their intended destinations.