What is digital signal

The signal is a physical quantity, which contains some information. The signal is an electrical current or electromagnetic field used to carry data from one place to another. 

The signal can be two types :

 1. Analog signal
  2.Digital signal

What is a digital signal?  

A digital signal is a signal that is being used to represent data as a sequence of discrete values at any given time and it can take only one of a finite number of values. 

Digital signals can be sent for long-distance and suffer less interference than an analog signal. 

Digital signals are easily represented by a computer because It described as using binary (  0s and 1s) and therefore, cannot take on any fractional values. Each sample can be with a series of bits that are either in the state of on (1) or off (0).