A single torrent consists of multiple files that is concatenated together and split into equal length pieces. The torrent file contains a list of the files, their lengths and for each piece it have a unique hash to make sure it gets the right data from the peers. This means that if someone were to send out the wrong data the client will notice because the hash does not match the one in the torrent file. The torrent file also contains lists of trackers and other metadata that might be useful to the client.
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