I'll try to be as correct as I can with the knowledge that I have (which is limited):
Torrents keep track of where "data" can be found. The data can be virtually anything - for example a video file like WSOP
The torrent tracker hosts these torrent files, uploaded by members, and they keep track of who has what part of the data.
A seed = full data file
A leech = partial data file
You would need a torrent client like uTorrent (which is what I use) to be able to download torrents...
It really is a brilliant method for file-sharing online and puts the owner of the website at no risk seeing as how they do not host anything illegal (not that most poker torrents are), just a tracking file of a few byte
For a torrent site the community (uploaders/seeders/leechers) is everything - that's why I am spreading the word - I love the site and want it to improve and help others find their way there.
If you need help with torrents I'm sure you can post in their forums with any questions that you have. Torrent users are generally very helpful!