Use encryption
For best security, you should enable or set an encryption password. All Wi-Fi equipment will support a form of encryption; you should choose the type that is most secure and will work across all the devices you need to connect.
If possible, use WPA2 (Wi-Fi Protected Access). If you are using a home wireless network, you should choose WPA2 Personal. Some older devices may be unable to connect to a WPA2 network; in these cases, use WPA.
There are still some old devices that may not even be able to connect to a WPA network, and will require WEP (Wired Equivalency Privacy). While WEP encryption is slightly better than none at all, WEP is not considered secure, and you should avoid using it. If you do need to use WEP encryption, be sure to choose a very strong password, and change it relatively frequently
If possible, use WPA2 (Wi-Fi Protected Access). If you are using a home wireless network, you should choose WPA2 Personal. Some older devices may be unable to connect to a WPA2 network; in these cases, use WPA.
There are still some old devices that may not even be able to connect to a WPA network, and will require WEP (Wired Equivalency Privacy). While WEP encryption is slightly better than none at all, WEP is not considered secure, and you should avoid using it. If you do need to use WEP encryption, be sure to choose a very strong password, and change it relatively frequently