When we read books we found about transport layer like below
“A transport-layer provides for logical communication between the application
processes running on different hosts”
By host we mean, all the devices like laptops, smartphones, tablets,
TVs, gaming consoles, Webcams, automobiles, environmental sensing devices that are hooked up to the Internet.
By Application process, we mean different applications like Facebook, Hotstar, youtube, Whatsapp in our mobile etc.
By logical communication,
we mean that from an application’s perspective, it is as if the hosts
running the processes were directly connected; in reality, the hosts may
be on opposite sides of the planet, connected via numerous routers and a
wide range of link types.
So when we chat with friends using Whatsapp, we send messages to one another
without worrying about details of the physical infrastructure used to carry these messages.
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