In some countries does not exist what is called “freedom of information", and as a result of that media are very subjective and subordinated to the government.
Internet has become the most widely used media, and therefore also suffers from censorship. According to a study conducted by the universities of Oxford, Cambridge, Harvard and Toronto, there are 25 countries in the world that to a greater or lesser extent exercise censorship on the Internet. These are: Morocco, Tunisia, Libya, Sudan, Ethiopia, Syria, Jordan, Saudi Arabia, Yemen, Oman, UAE, Iran, Azerbaijan, Turkmenistan, Uzbekistan, Tajikistan, Pakistan, Bahrain, India, Myanmar, China, Thailand, Vietnam, North Korea and Singapore.

If you live in one of these countries you've probably encountered the annoying wall of censorship.
It is usually applied to web pages of foreign countries, and focused on political issues (digital newspapers, news pages, ...), religion, society (social groups against the regime, unions, ...), opinion (all types of blogs), and adult content (erotic and pornographic pages).
To skip censorship and hide your identity (IP), you must navigate an anonymous proxy, and this is achieved using websites such as: Obfsproxy, Zend2, Proxify, MegaProxy, and Surfproxy.
Or use software programs that can be purchased and downloaded through the Internet, such as Anchorfree.
Although it is thought that the Internet is a place with full freedom of information, in some countries it is not.

Source: Translated and actualized from http://artigoo.com/como-ver-paginas-censuradas