求一篇关于介绍网络的小短文,300字左右,不要太短或太长

求一篇关于介绍网络的小短文,300字左右,不要太短或太长
Computers for people to be able to do a lot of things we can use it to print documents,send and receive fax,business management,financial management,you can listen to music,watching movies,playing games,can be connected to Internet network,and can chat with friends around the world,but also In a very cheap price to make international long-distance calls it!像这个就太短了

The Internet,sometimes called simply "the Net," is a worldwide system of computer networks - a network of networks in which users at any one computer can,if they have permission,get information from any other computer (and sometimes talk directly to users at other computers).It was conceived by the Advanced Research Projects Agency (ARPA) of the U.S.government in 1969 and was first known as the ARPANET.The original aim was to create a network that would allow users of a research computer at one university to be able to "talk to" research computers at other universities.A side benefit of ARPANet's design was that,because messages could be routed or rerouted in more than one direction,the network could continue to function even if parts of it were destroyed in the event of a military attack or other disaster.Today,the Internet is a public,cooperative,and self-sustaining facility accessible to hundreds of millions of people worldwide.Physically,the Internet uses a portion of the total resources of the currently existing public telecommunication networks.Technically,what distinguishes the Internet is its use of a set of protocols called TCP/IP (for Transmission Control Protocol/Internet Protocol).Two recent adaptations of Internet technology,the intranet and the extranet,also make use of the TCP/IP protocol.For many Internet users,electronic mail (e-mail) has practically replaced the Postal Service for short written transactions.Electronic mail is the most widely used application on the Net.You can also carry on live "conversations" with other computer users,using Internet Relay Chat (IRC).More recently,Internet telephony hardware and software allows real-time voice conversations.