access key A 32-byte identifier-password that gives you certain permissions with a repository. Usually represented as a 64-character hex string like so: 7ce4dbf18f7af8b420ee942bae42030aab344e91dc0e839260fcd71a4c9879e3

address The pairing of both a server's host (be that an IP or a domain) with its port number, like so: 74.125.225.18:80, or google.com:80

archive The store of files you have chosen to keep.

file repository A service in the hydrus network that hosts files.

filtering A method of quickly deleting and archiving files within the client.

hash A file's unique identifier. The hydrus network uses SHA-256.

hydrus client An application that manages media and connects to services on the hydrus network.

hydrus network A loose collection of servers that attempt to make media management and distribution easier.

inbox A special tag the client gives to newly imported and downloaded files to make them easier to find and review.

mapping The pairing of a particular file with a particular tag.

message depot A service in the hydrus network that stores messages.

metadata Information about a file, but not stored within the file. Filename, size, hash, modified dates, tags and location are all good examples.

petition A request from an uploader for particular content to be removed from a repository.

tag A short string of text describing a file.

tag repository The service in the hydrus network that hosts mappings.