How does the 'connect to pc ' wifi sharing feature of file sharing applications like xender work ?

Wherever I try to share files over WiFi from my android onto my PC the appliaction instructs me to connect to a address ( web.xender.com for xender ) . now it is easy to understand how a PC can connect to an ip within a network like 192.168.x.x but how does this app create a hoatname. How am I able to access the appliaction with a domain name inside my private network. What is happening here ?

I would like to make an application with the same feature, can you point me towards some tutorial to implement the same ?

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