1. advantages
1.1. wifi everywhere
1.1.1. convenient to go to internet
1.2. provide a strong passphrase
2. Definition
2.1. a technology that allows an electronic device to exchange data wirelessly (using radio waves) over a computer network
3. Future development of Wifi
3.1. 'faster rate"John Cox(2009)
3.1.1. "up to 450Mbps and 600Mbps" John Cox(2009)
3.2. stronger signals
3.2.1. more stable and can be used in larger area
4. operation
4.1. exchange data wirelessly
4.1.1. radio wave
5. history of Wifi
5.1. "invented by NCR Corporation with AT&T in Nieuwegein, the Netherlands in 1991" Wil-Corp, Inc(2007)
5.1.1. "invented for cashier system at first" Wil-Corp,Inc(2007)
5.1.2. "the first Wifi product was named WaveLAN with speeds of 1Mbps/2Mbps"Wil-Corp,Inc(2007)
5.2. "Vic Hayes is "father of Wifi""Wil-Corp,Inc(2007)
5.2.1. "designed standards such as IEEE 802.11b, 802.11a and 802.11g"Wil-Corp,Inc(2007)
6. How is Wifi changing the way of life?
6.1. wifi is available to many devices
6.1.1. camera
6.1.2. computer
6.1.3. smart phone
6.2. shorten the distance between people
6.2.1. people communicate with each other in different countries
6.2.1.1. whatsapp
6.2.1.2. viber
6.2.1.3. line
6.3. download information at anytime and everywhere
6.3.1. receive more information
6.4. more convenient
6.4.1. can access to internet immediately by using different electronic devices
6.5. use more time on phone
6.5.1. people surf the internet using mobile devices when they are travelling or eating
7. disadvantage
7.1. risk of data security
7.1.1. Stealing other's personal information in smartphone and computer devices are easier
8. Comparison between Wifi and home networking and 3G/2G/4G
8.1. Cost
8.1.1. Wifi is free in some places like restaurants, libraries, schools and government offices while home networking and 3G/2G/4G need to pay in order to use.
8.1.2. people can connect their mobile devices in places providing free Wifi even in different countries without paying. But 3G/2G/4G needs to be paid when people are using in different countries.
8.2. stability
8.2.1. home networking is more stable than Wifi and 3G/2G/4G because the strongnesses of signals of Wifi and 3G/2G/4G differ in different parts of the place.
8.3. convenience
8.3.1. Most mobile devices can access to wifi and 3G/2G/4G like smartphone, PC and etc.
8.3.2. Home networking can only be used when the electronic devices have the network card.