isoHunt is a BitTorrent index

Index (publishing)

An index is a list of words or phrases and associated pointers to where useful material relating to that heading can be found in a document...

 with over 1.7 million torrents in its database and 20 million peers

Peer-to-peer

Peer-to-peer computing or networking is a distributed application architecture that partitions tasks or workloads among peers. Peers are equally privileged, equipotent participants in the application...

 from indexed

Index (search engine)

Search engine indexing collects, parses, and stores data to facilitate fast and accurate information retrieval. Index design incorporates interdisciplinary concepts from linguistics, cognitive psychology, mathematics, informatics, physics, and computer science...

 torrents. With 7.4 million unique visitors , isoHunt is one of the most popular BitTorrent search engines. Thousands of torrents are added to and deleted from it every day. Users of isoHunt perform over 40 million unique searches per month. On October 19, 2008, isoHunt passed the 1 petabyte

Petabyte

A petabyte is a unit of information equal to one quadrillion bytes, or 1000 terabytes. The unit symbol for the petabyte is PB...

 mark for torrents indexed globally.