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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.


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