what does it means when "waiting" appear when you are calling a person?

Hi, i am using nokia E75 and i was wondering what does it means when "waiting" appear when I am calling a person? thousand thanks!!

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Yeah as mentioned above, the phone lines busy because the person your attempting to call is already on the phone to someone else.

When you are calling to someone and a third person calls you then waiting appears.It means he/she is waiting you to receive her/his call.

It means you could choose to wait until he/she end calls,or you could call him/her later.

It means the user is busy while talking with someone at the same time.

Hi what does it mean when u ring someone an it says call waitin also normally if i call a person an their phone is ringin out but then i go to the wats app an that is also ringin out does that mean the person isnt on the phone coz normally if i ring someone on their smart phone an its jus ringin out but then i ring their wats app an it says such an such a person is on another call obviously that means their mobile is engage dosent it