Freenet is like BitTorrent with web sites. Freenet is an anonymous peer-to-peer data-sharing network where uploaded data is assigned a unique key then broken-up into small, encrypted chunks which are then scattered across multiple computers on the network.
When someone wants a document, photograph or some other data, they “fetch” it from the network using the unique key assigned to that data. The fetch requests get routed through intermediary computers that don’t house the requested data, This ensures that no single computer on the network knows the contents of any individual data file.
With the Freenet client running on your PC, you can use most Web browsers to browse files and websites (AKA freesites) on the Freenet. The client allows you to access the Freenet welcome page (http://127.0.0.1:8888/) using your normal browser. From this welcome page, you can move on to browse Freenet, chat on Freenet forums, and communicate with other Freenet users.
Freenet has a darknet mode (AKA friends-only mode) for maximum privacy. In darknet mode, you connect to Freenet through trusted associates with whom you exchange encryption keys, which makes it difficult for anyone to track your movements on Freenet or even that you’re using Freenet. Of course, funneling your Freenet access through a handful of trusted associates may create a traffic bottleneck that slows response times. To avoid this, get five or ten friends to join up with you so you can fetch Freenet websites and files at greater speed.
Don’t expect this to provide total anonymity if you are doing something that is illegal or a risk to national security. Freenet has been infiltrated by police agencies that have created their own Freenet nodes to deanonymize users. You can be certain that national intelligence agencies have done the same.