What is mux in server?

Could you please elaborate on the term "mux" in the context of servers? I'm curious to understand its function and significance within a server's architecture. Is it related to multiplexing, a technique used to transmit multiple signals over a single communication channel? How does it impact server performance and scalability? Are there specific use cases or industries where "mux" in servers is particularly relevant? I'm looking forward to your insights on this topic.