Wi-Fi

Wi-Fi lets us go on the internet without plugging in a cable. It sends information through the air using radio waves. A small box called a router sends out the signal. Phones, tablets, and computers can pick up that signal and connect.

Where Wi-Fi Came From

Wi-Fi was made in the 1990s. Scientists wanted an easy way to connect computers without wires. The first Wi-Fi for homes came out in 1997. Since then, it has become faster and stronger each year.

A tall tower that sends signals through the air.
A tall tower that sends signals through the air. (R. Kreyser / Wikimedia Commons)

Where We Find It

Wi-Fi is in homes, schools, and libraries. Many coffee shops and airports let people use their Wi-Fi for free. Wi-Fi has changed how we watch movies, play games, and learn. Some new smart homes even use Wi-Fi to control lights and doors.

Fun Facts

  • The name Wi-Fi does not actually stand for anything.
  • An Australian scientist helped invent the technology behind Wi-Fi.
  • Wi-Fi signals can pass through walls but not through metal.

Did You Know?

There are now over 20 billion devices in the world that use Wi-Fi to connect to the internet.