What is Data Communication

Data Communication Communication can be defined as the exchange of information between two or more bodies. In engineering,

exchange of information is not only between people, 

information exchange also takes place between machines or 

systems. Communication has increased significantly in 

importance in recent years. Voice services have seen 

unprecedented increase in use throughout the world with the 

introduction of mobile phones, with embedded data services 

such as SMS, and web browsing.

Data is referred to as a piece of information formatted in a 

special way. Data can exist in a variety of forms, such as 

numbers or text on pieces of paper, 

as bits and bytes stored in electronic memory, or as facts 

stored in a person's mind. Strictly speaking, data is the plural 

of datum, a single piece of information. In practice, however, 

people use data as both the singular and plural form of the 

word. In electronics terms data is a digital bit or digitized 

analog signal. Signals are physical quantity that changes with 

time. 

Signal can be a voltage that is proportional to the amplitude of 

message. It could also be a sequence of pulses in fiber optics 

cable or electromagnetic wave irradiated by an antenna. 

When these signals are transfer between two or more points 

we say data is transmitted. Transmission of data from source