technical: a group of people used in a study who have something (such as age or social class) in common. Depression was a common problem for people in that age cohort.echnical: a group of people used in a study who have something (such as age or social class) in common. Depression was a common problem for people in that age cohort.
Wi-Fi is the name of a popular wireless networking technology that uses radio waves to provide wireless high-speed Internet and network connections. A common misconception is that the term Wi-Fi is short for  wireless fidelity , however this is not the case. Wi-Fi is simply a trademarked phrase that means IEEE 802.11x.
A wireless network includes a device called a wireless router or access point that sends and receives radio signals similar to a cordless phone base station. Other wireless devices on the network, like computers and printers, are like the cordless handsets. All communication on the wireless network runs through the wireless router, allowing the connected devices to talk to each other as well as share an internet connection provided by an Internet Service Provider (ISP).