Network Interface Cards (NICs), or simply network cards, are hardware components that enable computers to connect to a network. These cards allow the computer to communicate with other devices on the same network, both locally and over the internet. Network cards can be wired, using Ethernet cables, or wireless, utilizing technologies such as Wi-Fi. They are present in various devices, from desktop computers to laptops, servers, and gaming consoles, and are essential for network access and communication. Network cards can support different data transfer speeds and connectivity standards, and their selection depends on the specific needs of the user and the network environment.