The primary purpose of the Internet is to transmit information. As soon as the Internet came into being information could travel across the world almost instantly. This alone has impacted the practicalities of almost every industry in the world. It has changed the shape of administration and shortened the time it takes for documents to move from one place to another making industry more productive.
The way we consume information has changed drastically too, news and information can be accessed instantly from anywhere in the world. This not only means that we can get information quicker, but also that traditional information sources like newspapers have been forced to adapt to a new role by adding context rather than news.
One of the biggest impacts that the Internet has had is on the communication between normal citizens. Anybody can post something on the Internet that will can be seen by anyone else, it has essentially democratised mass communication. Websites like Facebook, Myspace and Twitter have revolutionised the way we organise our social lives, while websites like Youtube have and iPlayer have changed the shape of our entertainment.
Media piracy and social media have changed our legal systems making so called super injunctions almost pointless and intellectual property laws seem equally toothless. People can download music, videos and computer programs without paying for them, and information can be published with minimal risk of incrimination.