Signals -analog and digital

Signal is nothing but information carrier and it has many forms .Here I want to explain about electrical signals in analog and digital.
Analog is in continuos signal in time domain,in simple terms a speech signal is continuos if a singer is singing a song.Offcourse there wont be any signal if singer stops singing.Intial days the data is transmitted in the form of analog.This is prone to noise and accuracy is low.
Digital signal is in the form of 1's and 0's i.e, combination of 1's and 0's.Suppose I want digital represenation of word "hello".In the ascii format "h,e,l,l,o" is represented as "72,69,76,76,79" decimal.This is converted to binary and can be processed furthur as modern day DSP algorithms do.If the data is transmitted after encrypting like olleh instead "hello".This brings lot of information security and easy processing.