Difference between Pulse Wave and PWM ?

[Etude]

Hi! I have been getting really confused about this one thing. Can someone please clear my confusion ?
Is there a difference between Pulse Wave and Pulse Width Modulation? If yes, what is it ? If no, can one be used in place of the other ?
Thanx !

 

[berkeman]

Hi! I have been getting really confused about this one thing. Can someone please clear my confusion ?
Is there a difference between Pulse Wave and Pulse Width Modulation? If yes, what is it ? If no, can one be used in place of the other ?
Thanx !

It looks like the Pulse Wave or Pulse Train has constant duty cycle, as opposed to PWM where the duty cycle varies:

http://en.wikipedia.org/wiki/Pulse_wave

.

 

[Etude]

Hey! Thanx! I read the wiki article before but your single line there was more helpful. :)