what's difference between RF,microwave?

RF means radio frequency that is frequency that you can transmitt using antennas.
microwave is a part of RF spectrum.

Exactly we cant define the boundaries of RF and Microwave.

Acccording to frequency range,
RF - 30MHz to 3 GHz.
Microwave - 3GHz and above....

Refer to the attachment for IEEE Frequency Spectrum.