a short a precised presentation on wifi's introduction and working.

1. WHAT IS WIFI?
Wireless technology has widely spread lately and
you can get connected almost anywhere; at
home, at work, in libraries, schools, airports,
hotels and even in some restaurants.
Wireless networking is known as Wi-Fi (Wireless
Fidelity) or 802.11 networking as it covers the
IEEE 802.11 technologies. The major advantage of
Wi-Fi is that it is compatible with almost every
operating system, game device and advanced
printer.

15. WHAT IS HOTSPOT?
• The term Hotspot is used to define an area where Wi-Fi
access is available. It can either be through a closed
wireless network at home or in public places like
restaurants or airports.
• To be able to access Hotspots your computer should
include a wireless adapter. If you are using an advanced
laptop model, it will probably include a built-in wireless
transmitter already. Otherwise you can purchase a
wireless adapter that will plug into the PCI slot or USB
port. Once installed, your system will automatically detect
the Wi-Fi hotspots and request connection. If not, you
should use a software to handle this task for you.

16. How does Wi-Fi work?
There are three most important items which makes Wi-Fi working in your laptop
or desktop. These are:
• Radio Signals
• Wi-Fi Card which fits in your laptop or computer.
• Hotspots which create Wi-Fi Network.
• Radio Signals:
• Radio Signals are the keys which make WiFi networking possible. These radio
signals transmitted from Wi-Fi antennas are picked up by WiFi receivers such
as computers and cell phones that are equipped with WiFi cards. Whenever a
computer receives any of the signals within the range of a WiFi network which
is usually 300 - 500 feet for antennas, the WiFi card will read the signals and
thus create an internet connection between the user and the network without
the use of a cord.
• Access points which consist of antennas and routers are the main source which
transmit and receive radio waves.

17. •Wi-Fi Cards:
You can think WiFi card as being an invisible cord that
connects your computer to the antenna for a direct
connection to the internet.
WiFi cards can be external or internal, meaning that if a WiFi
card is not installed in your computer, you may purchase a
USB antenna attachment and have it externally connect to
your USB port, or have an antenna-equipped expansion card
installed directly to the computer. For laptops, this card will
be a PCMCIA card in which you insert to the PCMCIA slot on
the laptop.

19. How to start a wifi
connection?
What you’ll need:
• a wireless router
• a computer with a built-in wireless adaptor or a separate adaptor.
Step 1: Set up your wireless router
Step 2: Check that your computer has a built-in wireless adaptor (see left). Up-to-date
laptops generally have one, but most desktop computers don’t.
Step 3: To connect to a wireless network, click the wifi icon. You should now see a list of
available networks
Step 4: To connect to a network, just click on its name. If it’s a secure network and it’s
the first time you’ve used it, you’ll need a password. If it’s your home network, your
internet provider will have given you a password – sometimes it’s printed on a sticker
attached to the router.