Listener is like the receptionist at an organization. The receptionist directs any incoming call to the person requested for. She knows/has access to all the extension numbers and knows who sits where in the building. Whenever someone (user) calls she asks for the person name (database name) to whom the caller wants to talk (connect), and then connects the caller (create a server process) to the person, then waits for other calls.
If you know how a receptionist works you know how a listener works
HTH
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