www.bigdataroom.net/how-to-block-someone-on-hangouts
Data communication is the transfer of information through a network. It could be a wired medium, such as copper wires or optical fibers or a wireless medium such as microwaves or radio waves or even a computer bus. The electromagnetic signal that is used to transfer data can vary in speed or amplitude.
In data communication the most challenging task is transmitting data over long distances. Signals that travel over long conductors may be affected by noise or electrical distortion that can cause corruption of the original data.
Error detection is an essential element of a successful data communication. This is achieved by adding checksums to the data packets which make up a transmission, and then comparing that sum to all the packets at destination. If the resultant sum is equal to zero, then there are no errors occurred in the data transmission.
For reliable and accurate data communication, it’s necessary to keep a high transmission rate. This can be achieved either by ensuring the data transfers on a medium without interference or by sending redundant data to avoid the loss that is caused by interruptions in a moment.
Data communication that is effective is essential for a variety of applications, such as chat, traffic information, file downloads and Internet-based services. For instance, traffic information provides real-time estimates of traffic drivers and passengers in vehicles on the road, which can assist them in making better informed decisions regarding their journey.