Every wireless network has a name, otherwise known as its SSID (Service Set Identifier). The SSID is assigned by your wireless router.
Many router companies use their company names as the default SSID. (For example, a Linksys router might have a SSID labeled "LINKSYS".) This type of common SSID could give your network the same name as other wireless networks in your neighborhood, which makes it easy for hackers to locate and gain access to your network. For this reason, you should override your router's default SSID and assign a more unique name to your wireless network.
In addition, you should turn off your router's option to broadcast the network SSID, if available. When a router broadcasts the SSID, anyone with a laptop PC or wireless access point will receive notice of your network's name. If the SSID is not broadcast, your wireless network will be less visible to outsiders.