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Unguided Media Unguided media transport electromagnetic wave without using a physical connection. This type of communication referred as wireless communication. We can divided wireless transmission in :-   1. Radio Wave:- Electromagnetic   waves ranging in frequencies between 3KHz and 1GHz are normally called radio wave.   On radio wave connectivity used communication used Bluetooth, Wi-Fi, etc.     Bluetooth :- It is a wireless network connectivity that enables to connect or transfer data between devices over a short range the physical range of connection up to 100 meter. Ex- Mobile phone, barcode scanning, portable speaker, wireless keyboard, mouse etc.      Wi-Fi (Wireless Fidelity):- Wi-Fi is a network of wireless connection. Wi-Fi network establish by radio frequency like Bluetooth, but has more power, resulting a strong connection.    ·   Wi-Fi is also called wireless Ethernet. It has connectivity range up to 150 metres.     Wi-Max :- Wi-max stands for wo

E-MAIL ADDRESS E-mail stands for ‘Electronic Mail’. It is a paperless method of sending messages, notes, pictures and even sound files from one place to another using the Internet as a medium. It is an individual name, which is used to send and receive E-mail on the Internet. It is used to specify the source or destination of an E-mail message. The format of an E-mail address is user@domain. Where, ·          the first part (user) identifies a unique user name. ·          “@” separates the user from the domain, which identifies the mail server. The E-mail is transmitted between computer systems, which exchange messages or pass them onto other sites according to certain Internet protocols or rules for exchanging E-mail. You can send E-mail from your computer at any time to any address around the world and your electronic letter or E-mail will arrive at its destination in seconds after you send it, even if the receiver i