what is data communication ?

 data communication

The exchange of data between two devices through a transmission medium is
Data Communication.
The data is exchanged in the form of 0’s and 1’s.
The transmission medium used is wire cable.
For data communication to occur, the communication device must be part of a
communication system.
Data Communication has two types Local and Remote which are discussed below:
Local :
Local communication takes place when the communicating devices are in the
same geographical area, same building, face-to-face between individuals etc.
Remote :
Remote communication takes place over a distance i.e. the devices are farther.
Effectiveness of a Data Communication can be measured through the following
features :
1. Delivery : Delivery should be done to the correct destination.
2. Timeliness : Delivery should be on time.
3. Accuracy : Data delivered should be accurate.
A set of devices often mentioned as nodes connected by media link is called a
Network.
A node can be a device which is capable of sending or receiving data generated by
other nodes on the network like a computer, printer etc.
These links connecting the devices are called Communication channels.
Computer network is a telecommunication channel through which we can share
our data. It is also called data network.
The best example of computer network is Internet.
Computer network does not mean a system with control unit and other systems
as its slave. It is called a distributed system.
A network must be able to meet certain criteria, these are mentioned below:
1. Performance
2. Reliability
3. Scalability

Components of Data Communication

1. Message : It is the information to be delivered.

2. Sender : Sender is the person who is sending the message.

3. Receiver : Receiver is the person to him the message is to be delivered.

4. Medium : It is the medium through which message is to be sent for example

modem.

5. Protocol : These are some set of rules which govern data communication.