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Network Tunneling - why do we need it?

I have researched the topic of Network Tunnel but the information on this is rather confusing and inconsistent. So could someone please explain:
 
In general, What is tunneling? Is it simply an act of encapsulating a packet with another header and destine it to another point?
What is the purpose of tunneling? A switching or routing network is capable of delivering traffics, why then would you need a tunnel? What is the advantage?
 
Please help...
 
I didn't find the right solution from the Internet.
References
https://networkengineering.stackexchange.com/questions/43260/network-tunneling-why-do-we-need-it

 

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