what are monopole and dipole antennas

can any one tell me wat are monopole and dipole antennas......wat is major difference between them.....and which antenna is more advantageous......

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Monopole is an antenna with just the radiating element where the ground of the transmitter is connected to an electrical ground which serves as an Image ground to the radiating element. Thus the name "mono" pole.
Dipole is where the ground and the radiating elements are connected to two different elements where one is the radiating element and the other is the ground to the later. Thus the name "Di" Pole
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Please explain...