If the values are only 0 and 1 then the signal is digital.

1. Digital Signal is non-continuous signal where as analog is continuous signal

2. Digital signal contain only two value that is 0 or 1,or high or low where as analog contain all the values in it's time interval

3.Chance of attenuation in analog is more then digital signal

using LED.when the signal is 1,then the LED glows,but when signal is 0,then it does not glow.

The basic elements in digital signal processing are an analog to digital converter, digital signal processor, and digital to analog converter. This process can take an analog input signal, convert it to digital for processing and offer an analog output.

Digital signals are "forced" to be either 1 or 0, whereas analog signals are not. This means that a signal of 0.8 will be pushed to 1 in a digital signal and will remain 0.8 in an analog signal, and 0.2 will be 0 digital and 0.2 analog. This means that in order to overwhelm a digital signal the noise must do much more work to be effective. digital signal have only two states analog have infinite states therefore more susceptible to noise