If you are using an old computer, it may not have wireless connections. My advice would be to use a wireless router for your connection. If this doesn't help, I would also connect with an adapter.
Modem.
No. A network adapter is usually a card that slots into your computer allowing it to access some kind of network, wired or wireless. A wireless router is a separate device that connects wireless clients (your computer) to some kind of network (usually the internet).
A computer network adapter is used to connect a computer to the internet source that is provided by a modem. The only exception is the wifi router when it comes to the discussion on what is better.
Wireless adapters (USB or not) are good for connecting to wireless networks (aka WLAN or WiFi).
A network adapter, network card, LAN Adapter, NIC, etc is a piece of computer hardware used to allow computers to communicate over a computer network. Used for connecting to the internet.
When selecting a wireless network adapter for a wireless network, it is important to be aware of the technology and capabilities of the router. The latest technology used in wireless routers is 802.11N, which is backward compatible with older networking protocols such as 802.11g and 802.b. However, the performance of signal transfers of a wireless network adapter is limited by the technology used in the router. For example, a wireless-N adapter will not reach its full Mbps speeds of data transfer when connected to a wireless-G router.
It is a network adapter whether it is wireless or wired type.
A USB wireless network adapter is a device that allows you to connect to a wireless network as is connected to a computer via a USB port.
You will need a router, wireless adapter, to have a network connecting computers
Network Interface Card used for connection with computer. Wireless router to connect internet with mobile. Wifi adapter also used to connect internet with your computer.
Computers connect to the Internet via a network interface card (NIC) or wireless LAN adapter (WiFi adapter). Historically, computers could also connect to the Internet via a built-in modem for use with telephone lines.
It can connect to your WiFi network, and yes, it is a computer.