A component
1. Storage device
2. Output device
3. Main memory
4. Processor
5. Input device
A function
a. It displays the processed data.
b. It holds the programmers and data, which the processor uses.
c. It does all the processing and controls the peripherals.
d. It provides permanent storage.
e. It enters data.
9. Read the text attentively and find the answers to the following questions.
1. 
What are computers?
2. What operations do computers perform?
3. A computer doesn't think, does it?
4. Is a computer a simple electronic machine? Why / why not?
Computers are electronic machines. They communicate with the user, perform different kinds of arithmetic operations, such as addition, subtraction, division and multiplication, solve a series of logical problems and make thousands of logical decisions. Modern computers operate quickly and accurately. However, they don't think.
Every computer consists of software and hardware. Information in the form of programmers and data is called software, but the pieces of equipment that make up the computer system are known as hardware.
The most important item of hardware is the CPU (Central Processing Unit). This is the electronic unit at the centre of the computer system. The brain of the computer is the processor. It does all the processing and controls all the devices in the computer system. The main memory stores all the programmers and data used by the processor.
All the other devices in the computer system are known as peripherals. These include input devices, output devices and storage devices. An input device supplies information into the computer. The most commonly used input device is a keyboard. An output device such as a monitor or a printer displays the processed data. A storage device is used for the permanent storage of information on floppy discs or CD-ROM discs.
10. One of you is a teacher of Computer Science. The other is a student. The student is taking a test on computer components and functions. The teacher is asking questions and checking if everything is correct. Reproduce this conversation. Work in pairs.
Useful phrases:
What is this device called?
What is its function?
Before reading the text answer the following questions.
1. How many people use the Internet these days?
2. What popular Internet services do you know?
3. Do you often use the Internet? What for?
12. Now read the text about the Internet service.
The Internet
The Internet is a global computer network that embraces millions of users all over the world. It dates back to 1969 when it beganas a military experiment. Information that people send over the Internet takes the shortest path available from one computer to another. Because of this, any two computers on the Internet stay in touch with each other as long as there is a single route between them. This technology is called packet switching network2. Owing to this technology, if some computers on the network fail, the information just routes around them.
One of the most popular Internet services is e-mail. Most of the people, who have access to the Internet, use the network only for sending and receiving e-mail messages. However, other popular services are available on the Internet: reading USENET News, using the World-Wide Web and Intranet.
However, some problems remain. The most important is security. When you send an e-mail message to somebody, this message travels through many different networks and computers. Special computers that are called routers3 direct the data towards its destination. That is why it becomes possible to get into any of computers along the route and even change the data that we send over the Internet. This happens because the Internet transmits nearly all the information, which we send without any form of encoding.
__________
2.мережа комутації пакетів
3.маршрутизатори
