What are the main functions of the "network card"? Do desktops and notebooks need network cards? What's the difference between wired network cards and wireless network cards?

NIC Network Interface Adapter (NIC for short). It is used to realize the physical connection between networked computers and network cables, provide a physical channel for mutual communication between computers, and carry out high-speed data transmission through this channel.

It can be said that at present, computers need a network card to connect to the Internet! (Early cats were actually a form of network cards) Whether it was a desktop or NB!

Network cards are divided into wireless and wired! Literally, you will know! The wired network card needs an optical cable to connect broadband to the host! The wireless network card, no matter what its name is, can be directly connected to the computer without cables! And connect to the network by receiving the electrical signal sent by the wireless router! Compared with the wireless network card, you can enjoy the network more freely without complicated cable arrangement restrictions. Therefore, it is the current development direction! However, because broadband signals must be converted into wireless signals, the transmission speed in this process is not as fast as that of direct access through optical fiber. In addition, wireless signals are greatly influenced by the surrounding electromagnetic signals! So the stability is not as good as broadband with wired access!