Bluetooth is a wireless technology that can send files over throw frequanzys. you can send them quiet quickly and easily. the files send in packets so they send faster a packet is a small piece of information. You can send the files at a distance of up to a couple of metres depending on how good the bluetooth is on the device you are sending it on and the device you are sending it too.
3g is 3rd generation technology that lets you browser the internet quicker throw a mobile network. 3g uses the mobile network to send signal back and forward kind of like a phone call but instead of the voices going back and forward its the internet data from the website.
WIFI is a network that used specially for internet it is not used for nothing else. wifi gets its information for along the phones lines in the ground and wifi comes from wired connection to a wireless connection. The speed of the internet will vary on your location where you live on how good the phones lines are. you can connect any device to the wifi network aslong as it has wifi built in.
Nic network interface card is a card that plugs into your motherborad on your computer the nic card is a vital piece of hardware to let your computer have a internet connection the nic card is for a wired connection.
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