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.
Wi-Fi is the implementation of Wireless LAN. Wireless LAN describes the broader concept of wireless networked communications between machines. Wi-Fi is a trademark that can be used on devices that meet the 802.11 standards. Wi-Fi is used by a variety of devices to allow them to connect to wireless networks and the Internet.