Okay, imagine you have a phone and you want to call your friend. You enter their phone number and press a button to make the call.
Dialrel is like that, but for computers! It's a way for one computer to connect to another computer over the internet. Just like how you need your friend's phone number to call them, computers need an address to connect to each other. This address is called an IP address.
When one computer wants to talk to another computer using dialrel, it sends a message to a special server that knows how to connect them. The server then connects the two computers together so they can talk to each other. It's like the server is a really smart phone operator that can help connect the call.
Dialrel is important because it allows different computers to work together and share information, even if they are far away from each other. Just like how you can talk to your friend even if they are in a different city, computers can talk to each other over the internet thanks to dialrel.