Grokster is a full-featured P2P file-sharing application that allows users to search for all types of digital media across the FastTrack network; other programs sharing media through FastTrack include Kazaa and Morpheus. Grokster is neither central server-based, like Napster, nor based on the Gnutella file-sharing protocol. The program uses a proprietary peer-to-peer protocol to share files among users on the network.

Grokster offers advanced features such as playlist creation and media management to easily organize your file collection. It also offers an embedded Microsoft media player for audio and video playback, instant messaging, and CPU utilization throttling. The program automatically resumes broken content streams by finding another source. Grokster also simultaneously transfers content files from multiple sources for fast downloads of large files, even from users with slower connection speeds.

Program has one significant difference to other FastTrack based applications -- Grokster has a deal with GigAmerica that allows it to promote independent artists to its users.

As with Gnutella (and really every single file-sharing application apart from Napster) you can share all kinds of media files with Grokster. And it really works - very well! Only minor con in the tool is the fact that, specially with fast connections, it takes quite a lot of CPU power -- remember to turn the supernode mode off.