Medusa is a 'server platform' -- it provides a framework for
implementing asynchronous socket-based servers (TCP/IP and on Unix,
Unix domain, sockets).

An asynchronous socket server is a server that can communicate with many
other clients simultaneously by multiplexing I/O within a single
process/thread. In the context of an HTTP server, this means a single
process can serve hundreds or even thousands of clients, depending only on
the operating system's configuration and limitations.