In the Tor network, what are Hidden Services and Directory Servers?

Hidden Services are servers reachable only inside Tor via .onion addresses, keeping both user and service anonymous; Directory Servers publish the regularly-updated list of available Tor relays.

Hidden Services (Versteckte Dienste): servers that let you access content without leaving the Tor network. They use .onion URLs, so both the user and the service stay anonymous — nobody learns the server's real IP, and the server never learns the visitor's.

Directory Servers (Verzeichnisserver): provide a kind of "table of contents" of the available Tor nodes. They support connection setup by publishing a list of all reachable relays and updating it regularly, so clients can discover working nodes to build circuits.

Tip: Directory Servers answer "which relays exist right now?"; Hidden Services answer "how do I host something anonymously inside Tor?"