How do computers communicate to eachother?

Ever wondered when you ping hi to your friend on Facebook from your computer how does the message gets delivered to his computer even though he is not in the same room? You must have thought of the communication between the computers?

Computers communicate to eachother via setting up network connections which are connected by wired or wireless means. The connection between the computer systems allow them to ‘talk’ to each other and share computing power. Networking includes the individual computer systems, the connections and the hardware that allows communication to happen.

According to an article in computer deal news as per research firm IDC Corp. the worldwide software-defined networking (SDN) market will grow from $960 million in 2014 to over $8 billion by 2018 with a robust CAGR of 89.4 per cent. (http://www.computerdealernews.com/news/software-defined-networking-to-become-8-billion-market/35977)

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