Audio Technica mic

Iwas just given an Audio Technica AT 825 microphone. What is the best application for this mic? I think it is a condenser mic, but, as ignorant as it may seem, I'm not really sure what that means, or how it differs from my sure 57 or 58. It also has a switch that could either be set pointing to a staight line, or a slightly bent line. I think it has something to do with it being a stereo mic, but any info anyone has is much appreciated...
 
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