IT 231: IT and Application
By the end of this chapter, you will be able to:
Every computer, from a smartphone to a supercomputer, performs exactly four fundamental functions.
Accepting raw data from the user or environment.
Transforming raw data into meaningful information.
Presenting the processed result to the user.
Retaining data and information for future use.
Together, these form the IPOS Cycle — the foundation of all computing.
The four functions work together in a continuous cycle:
Real-world example: You type a search query (Input) → The search engine finds results (Process) → Results appear on screen (Output) → Your history is saved (Storage).
Click each function below to place it in order (1→4). Then check your answer.
Input is any raw data or instruction entered into the computer from the outside world.
Input devices convert real-world signals into digital data the CPU can process.
Computers only understand binary (0s and 1s). All input — text, images, audio — must be converted into binary form before it can be processed.
01000001 (ASCII code 65 in binary)00000101Classify each device: is it primarily an Input, Output, or Storage device?
Processing is the transformation of raw input data into meaningful output. This is performed by the Central Processing Unit (CPU).
Together, the ALU and CU execute the Fetch-Decode-Execute cycle millions of times per second.
Measured in GHz. A 3 GHz CPU can execute 3 billion cycles per second.
Modern CPUs have multiple cores — each can process tasks independently, enabling parallel processing.
A small, very fast memory inside the CPU that stores frequently used data to avoid waiting for RAM.
The ALU performs arithmetic and logic operations on binary numbers. Try it below:
Output is the processed result delivered to the user or another system, transforming data inside the computer into something a human can understand.
Electronic output — exists only in digital form.
Physical output — exists in the real world.
Is the output a Soft Copy (digital/electronic) or Hard Copy (physical/tangible)?
Storage retains data and instructions, both when the computer is running and when it is turned off.
Directly accessible by the CPU. Also called main memory.
Not directly accessible by CPU. Larger capacity, slower speed.
Loses data when power is cut.
Retains data without power.
Click any level to learn about it. Fastest and smallest at the top; slowest and largest at the bottom.
Top = fastest, smallest, most expensive | Bottom = slowest, largest, cheapest
All four functions work together in a continuous, interconnected cycle:
Example: eSewa Digital Payment (Nepal)
How data flows through all four functions:
These four functions form the IPOS Cycle — the universal model for every computing task.