What is the difference in sound between a dynamic microphone and a condenser mic?

I know that condenser mics are powered, what I'd like to know is what the sound difference is? I'm also wondering about gain and feedback. Do you need less gain with a dynamic mic and does it cause more or less feedback. I run some karaoke shows and can't seem to keep my singers from stepping in... show more I know that condenser mics are powered, what I'd like to know is what the sound difference is? I'm also wondering about gain and feedback. Do you need less gain with a dynamic mic and does it cause more or less feedback. I run some karaoke shows and can't seem to keep my singers from stepping in front of the speakers. I need a solution.
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