all about the digital signal system

today we will study about the digital signals:-
as in my earlier post i defined about the digital signals
now i'll define the digital system as the system which processes or works on the digital signals....
the input signal to a digital system is digital and its output signal is also digital.....

advantages of the digital system:-
1.they are cost efficient
2.highly reliable systems
3.design is much easier
4.digital display of various parameter can be obtained.
5.digital signal have memory.

best examples of the digital systems:'
1.digital calculators
2.flip-flops
3.counters
4.computers