To most of us, Internet is an open world which you can use without any restrictions. But people at the offices have to follow Corporate policy or in certain parts of the world have restrictions from the Government to browse / open some websites or such websites which fall into certain categories. For e.g. YouTube is blocked in Pakistan, that's why people cannot open this particular website directly.
Since I am in Kuwait, I cannot open any Adult website (it's not like I want to browse these website, just giving you an example :p) because any website which fall into Adult category is blocked by the Government over here. There are many other websites which are specifically made for the people who live in US for e.g. Hulu, Netflix etc.
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