Answer :
'According to the lecture, the main components of the internet architecture are the physical, transport and application layers, and each of them perform distinct functionalities necessary for online communications.
Online communication is the way people use digital media to communicate, connect, trade, send, obtain, or receive information of any kind over the Internet. Online communication refers to any communication that takes place over the Internet.
Online communication is important because it enables remote communication and collaboration. Stay in touch with family, friends and colleagues through face-to-face communication and social media. It can also be used by businesses to keep up with work or to build their customer base.
The difference between online and offline is traditionally seen as the difference between computer-based communication and face-to-face communication (such as FaceTime). Online is virtuality or cyberspace, and offline is reality (that is, real life or "meatspace").
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