Please make me clear the difference between hearing and listening......

because i usually get confused while using these word...when i have to say hearing and when listening,it'sdifficult to underestand sometimes...
Hello, Qudsia - and welcome to English Forums.

'Hearing' is an uncontrollable experience; it is something which just happens to us: I can hear the bells. I heard an ambulance last night.

'Listening to' is a conscious decision we make: Please listen to this CD. I listened to her complaints all night.

I can't hear you because I am listening to Led Zeppelin.
Thank you sir for making the difference clear to me...