You drive a car, go to office, withdraw money from the bank, deposit money in the bank, prepare a dish etc. Everything you do is done by following certain rules and principles.
Similarly, When you browse on internet, visit websites, submit forms, login on facebook etc. are done following certain rules and principles (implicitly) you don’t get to know that you are following them but your computer and the internet are making sure that you do. These rules are and principles are specified under a protocol i.e. HTTP (Hyper Text Transfer Protocol)
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