All computer systems perform the following five basic operations for converting raw input data into useful information-

• Inputting:Process of entering data and instructions into a computer system.
• Storing:Saving data and instructions to make them readily available for initial or additional processing as and when required.
• Processing:Performing arithmetic operations (add, subtract, multiply, divide, etc.) or logical operations (comparisons like equal to, less than, greater than, etc.) on data to convert them into useful information.
• Outputting:Process of producing useful information or results for a user, such as printed reports or visual displays.
• Controlling:Directing the manner and sequence in which the above operations are performed.

Source: Lucent’s Computer