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• A computer is a programmable machine designed to perform arithmetic and logical operations automatically and sequentially on the input given by the user and gives the desired output after processing.
• Computer components are divided into two major categories:

  1. Hardware
  2. software
• Hardware is the machine itself and its connected devices such as monitor, keyboard, mouse etc.
• Software is the set of programs that make use of

  hardware for performing various functions.
• Computer is an electronic device which is used to store the data, as per given instructions it gives results quickly and accurately.
• Data - is a raw material of information.
• Information – is a proper collection of the data.
• Any digital computer carries out five functions in gross terms:

  1. Takes data as input
  2. stores data/instructions in its memory and use them when required
  3. Processes the data and converts it into useful information
  4. Generates the output
  5. Controls all the above four steps.
• Computer is an electronic data processing device which:

  1. accepts and stores data input
  2. processes the data input
  3. generates the output in a required format.
• Characteristics of Computer

  1. High Speed
  2. Accuracy
  3. Storage Capability
  4. Diligence
  5. Versatility
  6. Reliability
  7. Automation
  8. Reduction in Paper Work
  9. Reduction in Cost
  10. No IQ
  11. Dependency
  12. Environment
  13. No Feeling
• advantages of computer

  1. high speed
  2. accuracy
  3. storage capability
  4. diligence
  5. versatility
  6. reliability
  7. automation
  8. reduction in paper work
  9. reduction in cost
• Disadvantages of computer

  1. No iq
  2. dependency
  3. environment
  4. no feeling
• Computer is a very fast device.
• a computer is capable performing calculation of very large amount of data
• The computer has units of speed in microsecond, nanosecond, and even the picosecond.
• The calculations of computers are 100% error free.
• Computers perform all jobs with 100% accuracy provided that correct input has been given.
• A computer has much more storage capacity than human beings.
• Unlike human beings, a computer is free from monotony, tiredness and lack of concentration
• computers can do repeated work with same speed and accuracy.
• A computer is a very versatile machine.
• This machine can be used to solve the problems related to various fields.

  Computer
• Automation means ability to perform the given task automatically.
• Once a program is given to computer i.e. stored in computer memory, the program

  and instruction can control the program execution without human interaction.
• The use of computers for data processing in an organization leads to reduction in paper work and results in speeding up a process.
• Though the initial investment for installing a computer is high but it substantially reduces the cost of each of its transaction.
• A computer is a machine that has no intelligence to perform any task.
• Each instruction has to be given to computer.
• A computer cannot take any decision on its own.
• It functions as per a user’s instruction, so it is fully dependent on human being.
• The operating environment of computer should be dust free and suitable.
• Computers have no feelings or emotions.
• It cannot make judgment based on feeling, taste, experience, and knowledge unlike a human being.
• Applications of computers today:

  1. Business
  2. banking
  3. insurance
  4. education
  5. marketing
  6. health care
  7. engineering design
  8. military
  9. communication
  10. government
• A computer has high speed of calculation, diligence, accuracy, reliability, or versatility which made it an integrated part in all business organizations.

  Computer is used in business organizations for:

  1. Payroll calculations
  2. Budgeting
  3. Sales analysis
  4. Financial forecasting
  5. Managing employees database
  6. Maintenance of stocks etc.
• Banks provide online accounting facility, which

  includes current balances, deposits, overdrafts,

  interest charges, shares, and trustee records.
• ATM machines are making it even easier for

  customers to deal with banks.
• Insurance companies are keeping all records up-to-date with the help of computers.

  The insurance companies, finance houses and stock broking firms are widely using computers for their concerns.
• The computer provides a tool in the education

  system known as CBE (Computer Based Education).
• CBE involves control, delivery, and evaluation of

  learning.