1. E MAIL Electronic mail, commonly called e-mail or email, is a method of exchanging digital messages from an author to one or more recipients. Modern email operates across the Internet or other computer networks.digitalInternetcomputer networks An email message consists of three components, the message envelope, the message header, and the message body. The message header contains control information, including, minimally, an originator's email address and one or more recipient addresses.email address

2. FAX FAX (Facsimile Telegraphy) - Facsimile telegraphy deals with the transmission of typewritten or handwritten message, drawings, graphics, pictures or any matter which cannot be sent through telegraphs, telephones or teleprinters.This machine operates by converting the variances of light reflected from the image of the original matter into electrical impulses which can be reconverted onto the image from on reception. Connections can be made over very long distances using the public telephone networks or radio links. Fax is perhaps the speediest system presently available and transmitting and receiving a standard letter size document takes approximately four minutes, irrespective of the amount of matter on it.

3. In this system there is no scope for copying errors and so high order skills required at high skills. Even typed matter can be transmitted more effectively through fax than through the teleprompter since the former completely does away with the element of checking for errors inadvertently incorporated during transmittal of the matter.

4. TELECONFERENCING Usually, group communication takes place in person, in the same room, but new technology provides a facility for discussion with a group of persons on the internet. You can conduct a meeting, hold a group discussion or brief people scattered across the country or around the World.

5. It is an arrangement which facilitates the speakers to communicate each other in different localities using public telephone links. Participants of the conference located in different geographical distance areas can discuss issues by using their terminals that are linked together via the telecommunication network.

6. SOCIAL NETWORKING SITES A social networking service is an online service, platform, or site that focuses on building and reflecting of social networks or social relations among people, who, for example, share interests and/or activities. A social network service consists of a representation of each user (often a profile), his/her social links, and a variety of additional services. Most social network services are web-based and provide means for users to interact over the Internet, such as e-mail and instant messaging.

7. The main types of social networking services are those that contain category places (such as former school year or classmates), means to connect with friends (usually with self-description pages), and a recommendation system linked to trust. Popular methods now combine many of these, with Facebook and Twitter widely used worldwide.

8. VIDEOCONFERENCING Videoconferencing uses telecommunications of audio and video to bring people at different sites together for a meeting. This can be as simple as a conversation between two people in private offices (point- to-point) or involve several sites (multi-point) with more than one person in large rooms at different sites. Besides the audio and visual transmission of meeting activities, videoconferencing can be used to share documents, computer-displayed information, and whiteboards.

9. The components required for a videoconferencing system include: Video input: video camera or webcam Video output: computer monitor, television or projector Audio input: microphones, CD/DVD player, cassette player, or any other source of Preamp audio outlet. Audio output: usually loudspeakers associated with the display device or telephone Data transfer: analog or digital telephone network, LAN or Internet Computer: a data processing unit that ties together the other components, does the compressing and decompressing, and initiates and maintains the data linkage via the network

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