What a Network Adapter Does
A network adapter is the bridge between your computer and a network. It takes data from your computer and prepares it for transmission over the network. When data arrives from the network, it converts those signals back into a format your computer can understand. Without a network adapter, your computer cannot connect to the internet or other computers.
How It Converts Data
Network adapters use a process called encapsulation to package data. Your computer creates information in digital form, and the network adapter adds addressing information and breaks it into smaller pieces called packets. Each packet includes the sender's address, the receiver's address, and part of the original message. This allows data to travel reliably across the network to the correct destination.
Wired vs Wireless Adapters
Ethernet adapters connect to networks through cables and offer faster, more stable connections. They are commonly used in offices and for devices that stay in one place. Wireless adapters (Wi-Fi) connect without cables, making them convenient for laptops and mobile devices. Many computers today have both types built in, allowing users to choose which connection to use.
Network Adapter Hardware
A network adapter contains a processor, memory, and a physical connector or antenna. The processor handles the work of preparing data for transmission and interpreting incoming data. The memory stores temporary information during this process. The physical component either plugs into a cable socket or communicates wirelessly with a network router.
Communication Process
When you send data, the adapter breaks it into packets and sends them one at a time. The adapter checks that each packet was received correctly by the destination. If a packet gets lost or damaged, the adapter can request that it be sent again. This careful process ensures that important information arrives complete and accurate. 
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