写一篇英语作文

The computer is a very useful machine. It is the most important invention in many years.People use it widely today in many ways.
Most computers have memories.People can store information in them and take it out at any time.Computers are getting smaller and smaller, and working faster and faster.
Computer can do many kinds of work.Now in many large factories there are very few people. Computers do most of the work

Computer (computer), commonly known as computer, is a modern electronic computer for high-speed computing, which can carry out numerical calculation, logic calculation, but also has the memory function. It is a modern intelligent electronic device that can run large amounts of data automatically and quickly according to program.
A computer consisting of hardware system and software system without computer is called bare machine. It can be divided into five categories: supercomputer, industrial control computer, network computer, personal computer and embedded computer. The more advanced computers include biological computer, photonic computer, quantum computer and so on.
Computer inventor John von Neumann. Computer is one of the most advanced scientific and technological inventions in the 20th century. It has exerted an extremely important influence on human production and social activities, and has developed rapidly with great vitality. Its application field has expanded from the initial military scientific research application to various fields of society, and has formed a huge scale of computer industry, which has led to technological progress on a global scale, thus triggering profound social changes. Computers have spread throughout the general schools, enterprises and institutions, into ordinary people's homes, and become an information society. Indispensable tool.
The application of computers is becoming more and more popular in China. Since the reform and opening up, the number of computer users in China has been increasing, and the application level has been improved continuously. In particular, the application of the Internet, communications, multimedia and other fields has made good achievements. From 1996 to 2009, the number of computer users increased from 6.3 million to 67.1 million, and the number of networked computers increased from 29,000 to 59.4 million. Internet users have reached 316 million, and the wireless Internet has 670 million mobile users, of which 117 million are mobile Internet users, ranking first in the world.
Personal Computer (PC), computer in the form of a desktop or laptop device designed for use by a single person. PCs function using a display monitor and a keyboard. Since their introduction in the 1980s, PCs have become powerful and extremely versatile tools that have revolutionized how people work, learn, communicate, and find entertainment. Many households in the United States now have PCs, thanks to affordable prices and software that has made PCs easy to use without special computer expertise. Personal computers are also a crucial component of information technology (IT) and play a key role in modern economies worldwide.

The usefulness and capabilities of personal computers can be greatly enhanced by connection to the Internet and World Wide Web, as well as to smaller networks that link to local computers or databases. Personal computers can also be used to access content stored on compact discs (CDs) or digital versatile discs (DVDs), and to transfer files to personal media devices and video players.

Personal computers are sometimes called microcomputers or micros. Powerful PCs designed for professional or technical use are known as work stations. Other names that reflect different roles for PCs include home computers and small-business computers. Laptops are compact and portable personal computers that have many of the same capabilities as desktop computers but with reduced data storage capacity. Netbooks are small, very lightweight laptop computers that rely on an Internet connection to perform most applications rather than on stored software. The PC is generally larger and more powerful than handheld computers, including personal digital assistants (PDAs) and gaming devices.