Q: Input, output and processing devices grouped together represent an  

Functioning of a Computer
Computer performs four basic functions which are as follows

• Input: Information or data that is entered into a computer is called input. It sends data and instructions to the Central Processing Unit (CPU).
• Processing: It is the sequence of actions taken on data to convert it into information which is meaningful to the user. It can be calculations, comparisons or decisions taken by the computer.
• Output: It makes processed data available to the user. It is mainly used to display the desired result to the user as per input instructions.
• Storage: It stores data and programs permanently. It is used to store information during the time of program execution and possible to get any type of information from it.