What is Messaging system in c# ?

Question

Hi techies,

 

I am not familiar with the topic which I am going to ask below. So, please bear with my way of explanation in the requirement. 

 

My question here is to understand a technology wing of C#. That is Messaging. 

 

I wanted to know the term "Messaging " in c# and where we have to use it and how to use it. 

 

few samples 3rd party/ self messaging Technologies for C# I heard: MSMQ, NetMQ, Akka.net 

 

My understanding of messaging is:  Pass the messages of action to the desired destination using various techniques. 

But I don't know how this will be used in the real time scenario.  

 

So I am expecting the answer to the following. 

 

What is the messaging technology and why we have to use it and any sample use case (real-time)? 

what are the best messaging technologies used for it to develop in C#?  

 A sample application to understand the technology.