Computer, Meaning, Definitions, Characteristics and Components

Computer is an electronic machine that accepts data as input, processes it according to a set of instructions (called a program), and produces meaningful information as output. It works on the principle of Input–Process–Output (IPO). Computers can perform a wide range of tasks such as calculations, data storage, information processing, communication, and decision support. In business, computers are widely used for accounting, inventory management, payroll processing, data analysis, and report generation, thereby increasing speed, accuracy, and efficiency in operations.

Definitions of Computer

• According to the Oxford Dictionary:

“A computer is an electronic device for storing and processing data, typically in binary form, according to instructions given to it in a variable program.”

• According to Charles Babbage (Father of Computer):

“A computer is a machine that can perform calculations automatically.”

• According to the Computer Dictionary:

“A computer is a programmable electronic device that can accept data, process it logically, and produce information as output.”

• According to V. Rajaraman:

“A computer is an electronic device that can perform arithmetic and logical operations at high speed and store large amounts of information for future use.”

Characteristics of Computers

• Speed

One of the most important characteristics of a computer is its speed. Computers can perform millions and even billions of calculations within a fraction of a second. Tasks that take hours or days for humans, such as complex mathematical calculations or processing large volumes of data, can be completed by computers in seconds. This high speed helps businesses save time, increase productivity, and meet deadlines efficiently. Speed makes computers ideal for real-time applications like online banking, billing systems, and data analysis.

• Accuracy

Computers are known for their high level of accuracy. When correct data and instructions are provided, computers produce error-free results. Unlike humans, computers do not make mistakes due to fatigue or lack of concentration. Errors occur only if incorrect input or faulty programs are used, which is known as “Garbage In, Garbage Out (GIGO).” In business applications such as accounting, payroll processing, and financial reporting, accuracy is extremely important, and computers ensure reliable and precise outputs.

• Diligence

Diligence refers to the ability of a computer to perform tasks continuously without getting tired or losing efficiency. Computers can work for long hours without rest and can repeat the same operation millions of times with the same speed and accuracy. Humans may feel boredom or fatigue while performing repetitive tasks, but computers do not. This characteristic is especially useful in business operations like data entry, transaction processing, and monitoring systems that require continuous and consistent performance.

• Storage Capacity

Computers have a very large storage capacity, enabling them to store vast amounts of data and information. Data can be stored in various forms such as text, images, audio, and video. Modern computers can store information in hard disks, solid-state drives, and cloud storage. Stored data can be retrieved quickly whenever required. In business organizations, storage helps maintain records of customers, employees, transactions, and reports for future reference and decision-making.

• Versatility

Versatility means the ability of a computer to perform a wide variety of tasks. A computer can be used for accounting, designing, communication, data analysis, education, entertainment, and many other purposes. By changing the software or program, the same computer can be used for different applications. In business, computers are versatile tools used in marketing, finance, production, human resource management, and strategic planning, making them an essential multipurpose device.

• Automation

Computers work automatically once the instructions are given. After data and programs are loaded, computers perform tasks without continuous human intervention. This characteristic is known as automation. Automated systems reduce manual effort, save time, and increase efficiency. In business, automation is used in payroll systems, inventory control, online transactions, and manufacturing processes. Automation helps organizations reduce costs and minimize human errors in routine operations.

• Reliability

Computers are highly reliable machines. They provide consistent results over long periods of time and rarely fail if properly maintained. Computers can handle complex and critical tasks accurately, which makes them dependable for business use. Reliability is important in applications such as banking systems, airline reservations, and stock market operations, where even a small error can lead to major losses. This characteristic builds trust in computer-based systems.

• No Intelligence or Emotions

Despite their advanced capabilities, computers do not have intelligence or emotions of their own. They cannot think, judge, or take decisions independently. Computers work strictly according to the instructions provided by humans. They cannot apply common sense or creativity. In business, this characteristic highlights that computers are tools to assist managers and decision-makers, but human judgment, experience, and reasoning are still essential for effective decision-making.

Components of Computer System

Computer system is made up of several interrelated components that work together to process data and produce useful information. The main components of a computer system are Hardware, Software, Data, Procedures, and People (Users). Each component plays a vital role in the effective functioning of the computer system, especially in business applications.

• Hardware

Hardware refers to the physical and tangible parts of a computer system that can be seen and touched. It includes devices such as the central processing unit (CPU), keyboard, mouse, monitor, printer, scanner, hard disk, and memory units. Hardware performs tasks like inputting data, processing information, storing data, and producing output. In business organizations, hardware supports daily operations such as data entry, billing, documentation, and communication.

• Software

Software is a set of programs and instructions that tell the computer how to perform specific tasks. It is intangible and cannot be physically touched. Software is broadly classified into system software (such as operating systems like Windows and Linux) and application software (such as accounting, payroll, and word processing software). In business, software enables automation of operations, efficient data management, and decision-making support.

• Data

Data refers to raw facts and figures such as numbers, text, images, and symbols that are entered into the computer for processing. By itself, data has little meaning, but after processing, it becomes useful information. In business, data includes sales figures, employee details, customer records, and financial transactions. Accurate and timely data is essential for generating reliable reports and making informed managerial decisions.

• Procedures

Procedures are the rules, guidelines, and instructions that explain how to use a computer system. They define the steps to be followed while operating hardware, using software, and handling data. Procedures ensure consistency, security, and proper functioning of the system. In business organizations, procedures help standardize operations such as data entry, report generation, backup, and system maintenance.

• People (Users)

People, also known as users, are the human beings who operate and interact with the computer system. They include computer operators, programmers, system analysts, managers, and end-users. People are responsible for designing, operating, maintaining, and using computer systems effectively. In business, skilled users are essential to ensure correct input, efficient system usage, and meaningful interpretation of output.

• Input Devices

Input devices are used to enter data and instructions into the computer system. Common input devices include the keyboard, mouse, scanner, barcode reader, microphone, and webcam. These devices convert user input into a form that the computer can process. In business, input devices are widely used for data entry, billing, inventory tracking, and online communication, making them essential components of a computer system.

• Output Devices

Output devices display or produce the processed information from the computer. Examples include monitor, printer, speakers, plotter, and projector. Output devices help users understand and use the information generated by the computer. In business organizations, output devices are used to generate invoices, reports, presentations, and visual data representations, supporting communication and decision-making.