What type of adapter is commonly used to connect computers to a network?

The Network Interface Adapter is designed specifically for connecting computers to a network, typically through Ethernet cables or wireless connections. This type of adapter can be internal, integrated onto the motherboard, or external, plugging into USB ports or other interfaces. It enables communication between the computer and the network by converting the data from the computer into a format suitable for transmission over the network.

In contrast, the other options serve different purposes. A USB Adapter allows for the connection of USB devices but is not specialized for networking. A Sound Card is used for audio processing and output, having no role in networking. An HDMI Adapter is focused on transmitting high-definition video and audio signals, also unrelated to network communication. Thus, the Network Interface Adapter is the appropriate choice for establishing a network connection.