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Computer

What is a computer? A computer is an electronic device that receives and processes information to produce the desired results.

It plays an important role in our lives. Our life has become centered around computers and computerized systems.

Various Parts of a Computer: The various parts of a computer includes a system unit, monitor, keyboard, electronic-mouse, printer, speakers, CD drive, etc.

1. System Unit: The system unit is the most important part of the computer. The system unit houses the CPU (microprocessor), hard disk, random access memory (RAM), motherboard, etc.

The CPU processes the information.
RAM stores the temporary information while the system is on. It removes the data as soon as the system is switched off.
Hard Disk stores the saved information is stored on the hard disk.
The Mother Board connects and allows communication between various units of of the computer.
2. Monitor: It displays the information. Cathode Ray Tube (CRT) monitors are very bulky. Liquid crystal display (LCD) monitors are thin and light.

3. Keyboard: Letters and numbers are keyed into the computer system through the keyboard.

4. Mouse: It points the cursor and is used in selecting an icon on the screen.

The other components of a computer system includes speakers, modem, printers, etc.

Advantages

Computers can quickly process huge amount of data. Computers can complete various tasks more effectively than most human-beings. It has automated complex tasks that were once considered boring and tedious for humans. Hence, Computer has greatly increased our efficiency to do various tasks. The advantages of computer is given below:

Stores data in digital format: Computers can store millions of pages of information in digital format.
Huge storage: We can store huge information. The present day hard-disks can store 100s of Gigabytes (GB) of information. Large businesses store their marketing and sales data in their computer systems. Even sensitive data of customers are securely protected in a computerized environment.
Play games: When it comes to games, the choices are almost unlimited.
Calculations: Businesses are increasingly using spreadsheets and other software as a tool for performing mathematical calculations.
Prepare and store official documents: You can use a word processing software to prepare, edit and save any text document. The concept of paperless offices is finally taking its shape. excel- calculations
Presentations: If your office demands that you prepare presentations, you can prepare it in a PowerPoint.
Internet: You can connect your computer to Internet and browse through huge data. People use internet for various purposes. Students can use internet to download study materials. A research analyst can do market research over internet. A marketing person can gather relevant data across various geographical boundaries. A prospective customer can find a service provider over internet.
Multimedia: Computer can also be used as an entertainment device. We can play various multimedia applications such as music, video, etc.
Prepare books of accounts: With the help of accounting software, we can prepare our books of accounts.
Reduced cost: The introduction of computer has resulted into a reduction of cost to perform various complicated tasks.
Disadvantages

It is true that even computer is not free from defects. The disadvantages of computer is given below:

Ever changing technology: The technology that is new today, may soon become obsolete. We need to regularly upgrade the hardware and software in a computerized environment. This involves additional time and cost.
Increased manpower cost: The computer needs to be operated by skilled person. This has led to an increase in manpower cost for organizations. Due to the inherent risks, huge expenditure are made ensure data security.
Computer stops responding: At times the operating system of the computer may stop responding or functioning. Though this problem is generally solved by restarting the computer, but sometimes you may have to take the support of the technician.
Viruses: The threat of virus and malware attack always remains in the computerized environment. To cope up with these risks, various anti-virus software are available in the market. If you are using a good antivirus, you are almost sure that your private information and other sensitive data are secured.
Reduction in employment opportunity: The introduction of computers has negatively impacted the employability of computer illiterate people.