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In modern society, radio is a common electronic communication device that we listen to every day. The invention of telegraphy brought about the invention of the radio. The term "radio" refers to the transmission and reception of electromagnetic waves that carry voice messages and music. Devices that operate using these electromagnetic waves include radios, cordless phones, televisions, remote-controlled toys, etc.

Radio invention is believed to have happened in the mid-1800s and early 1900s. Although James Clerk Maxwell the Scottish physicist foretold the presence of radio waves in the 1860s, Heinrich Hertz opened doors to radio invention in 1886. The German physicist studied and established that electric currents could be discharged into space in the form of radio waves just like light waves. This is why radio wave frequency is measured in Hertz .

The question of "who is the first inventor of the radio?" is still a debated topic. Guglielmo Marconi, the Italian inventor, demonstrated the practicability of radio communication in 1895 when he sent and received his first radio signal. He patented this invention in 1896. In 1900, he received the letter "S," telegraphed across the Atlantic from Europe to America and this marked the first successful radio telegraphed message.

However, Nikola Tesla patented wireless radio transmitters in 1900 and was considered the first person to patent radio technology. Here are other inventors who contributed to making radio technology a success:

Radiotelegraphy refers to the transmission and reception of messages through radio waves instead of cables. It was originally made to transmit beeps in Morse code (coded message in dots and dashes) and it made communication between two points simple.

Radiotelegraphy became popular in the 1900s and it was mostly used by shipmen to communicate with other vessels and the shore. It was used in rescue work and it played a big role in rescuing the titanic ship disaster survivors; people believe that without the wireless signaling the rescuing process would not have been possible.

In 1901, the US Navy embraced the wireless system and the service was installed in five Hawaiian Islands. In 1905, the Russo - Japanese war was reported through wireless transmission. A year later, the US weather department used radiotelegraphy to monitor weather conditions.

In 1910, Marconi founded the American-European telegraphy service, which played a role in capturing the British murderer who had escaped. Two years later, transpacific radiotelegraph service was founded and it was linking Francisco with Hawaii.

Although the development of radiotelegraphy was a bit slow because of its instability, which caused interference, the Alexanderson high-frequency alternator came to its rescue.

Lee de Forest is the known inventor of the Audion, Triode amplifier, and the amplifying vacuum tube which could strengthen weak electrical signals. This made it possible for radio frequency to be amplified and picked by the antennae. The first inventors of the radio experienced technical problems because they did not have a good electromagnetic radiation detector. It was Lee de Forest who came up with the detector.

Lee de Forest used the Audion he invented to detect or receive voice messages. This led to the onset of radio broadcasting and later on television broadcasting.

Wi-Fi has enabled us to stay connected wherever we are whether at home or in public. You are most likely to see Wi-Fi sign-in restaurants, hospitals, government institutions, and even private ones. However, not many people understand the history behind Wi-Fi technology. We are going to learn what Wi-Fi is when it was invented and how it works.

Wi-Fi is a wireless networking technology that allows devices to communicate with each other within a fixed location without using cables for connection. This wireless local area network protocol uses the IEEE 802.11 network standard.

Wi-Fi is a trademark of the Wi-Fi Alliance, which is a non-profit organization, promotes wireless LAN technologies and certifies the Wi-Fi products.

The simplest way to understand Wi-Fi is to think about a home set up or business. You will require devices like router, phone, or computer to transmit the wireless signal. The router will transmit the Internet connection from the Internet Service Provider (ISP) to nearby devices that can access the wireless signal.

You can also create a Wi-Fi hotspot to work as a router. This will enable nearby devices like phones or computers to share the wireless Internet connection. Most modern gadgets are Wi-Fi enabled, meaning they can access a network to get an Internet connection and share the network resources.

The NCR Corporation together with AT&T Corporation in 1991 came up with the first wireless product called waveLAN that was in use in the cashier system. Although they are credited for inventing the first Wi-Fi, Vic Hayes is popularly known as the "father of Wi-Fi.” This is because he chaired the IEEE committee, which created and released the 802.11 standards in 1997. The IEEE802.11 set standards established Wi-Fi connection that defined communication for Wireless Local Area Networks.

The 802.11 standards allowed 2 megabytes of data per second (2mbps) to be transferred wirelessly between devices. It was improved in 1999 to enable it to transfer 11 megabytes of data per second (11mbps) and this became popular. In 1999, Wi-Fi was introduced to be used in homes.

A Wi-Fi router operates on two communication bands: 2.4 GHz (802.11b) and 5 GHz (802.11a). Here is the difference between the two frequencies: 5 GHz has high speed but goes a short distance while 2.4 GHz uses a low speed but goes a long distance .