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Learning About Wireless Router
There are basically 2 main types of wireless routers.  There is the basic wireless router which allows multiple connections to a single broadband source through both wired routing and WiFi.  The other type of wireless router is the wireless modem router, which is essentially a wireless router with a built-in modem.  It is commonly used for ADSL-based broadband connection.  Wireless router uses one of the following frequency band - 802.11a: 5 GHz 54 Mbps,
802.11b: 2.4 GHz 11 Mbps,
802.11g: 2.4 GHz 54 Mbps,
Super G: 2.4 GHz 108 Mbps,
Draft N: 2.4 GHz 300-400Mbps.
Mbps refers to the speed of data transfer, measured in megabit per second.
It should be noted that many cordless phones also operate on 2.4 GHz frequency. So placing a cordless phone near your wireless router can disrupt the signal.
For a PC or mobile device to link up with a wireless router, it need to have a wireless network interface card.  These are normally found in desktops as a PCI card.  You can retrofit a device with wireless network interface through a USB dongle. The USB wireless interface allows you to connect to wireless access points, the same way as wireless network interface card except that it uses a USB connection to your PC or mobile device.