Thanks, and I'm still figuring out how to fix the repetition.
Psytrance is almost literally trance on drugs. Psytrance is short for psychedelic trance. A couple of key things are the kick and drum, the synth special effects (like the "squelch"), and the emotional journey it takes you. I know thats like trying to explain "love" as "chemicals in the brain", but I'm new the the genre and there may be people who can explain it better than I.
Another key thing to mention is that psytrance got it's roots in Goa, India. That's how the very similar Goa Trance genre got it's name. Goa Trance is a more mellow form of psychedelic trance with more of a traditional Indian sound, whereas psytrance is more about experimenting with synths and is generally an insane form of a sound.
I must also say that psytrance is a bit of an aquired taste. Like I said, I'm not explaining it well, but that's the gist of it.