The card in the laptop turns the computer's

signals into radio waves and sends it to the

wireless router .

The wireless router picks up the signal, turns it back into traditional computer communications, and outputs it to the hard-line ethernet. The process is reversed to get the signal back to the laptop

Wireless router(WAP) is the most common connection for home. This connection uses a very localized wireless technology that transmit for limited distance almost few 100 feets arround your home. That connection actually uses the connection

that goes through your DSL connection through your ISP .