CARRIER

"Carrier" in its simplest sense means an item that can carry or transport some other item or items.  In the wireless world, it is often a high frequency that is used to transport low frequency information such as voice or data long distances. 

We are likely aware that voice by itself will just not travel that far.  However, if that same voice is combined with a high frequency carrier, such as 1 MHz, then the audio may be "carried" over the air waves long distances to an electronic receiver. The receiver would receive the high frequency carrier and then be able to decode the signal and recover the audio information.  The audio information is added to the high frequency carrier by one of several possible methods.  Those methods are called the means of modulation. However, it might be just simplest to think of the sending end as adding together the audio information and the high frequency carrier.  At the receiving end, the high frequency carrier is essentially subtracted off, leaving the audio or data information.  And by this method, the original signal was "carried" over the air waves by the high frequency carrier.