What is a simplified difference between Phase Shift Keying and Frequency Shift Keying?

What is a simplified difference between Phase Shift Keying and Frequency Shift Keying?
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answer:FSK adjusts the frequency, PSK adjusts the phase. We use nonstandard PSK in our work because we can design a pre-amp and amp around the one frequency and design a filter with broad Q in the range of the expected signals we are trying to extract. We don’t bother with quadrature. I am not sure if you are a beginner or not. If you are then forget about what I just said ;-) Here is a good reference with pictures. If you need more then look at fsk vs psk
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