What is a Computer?

At its simplest, a computer is an electronic device that manipulates information, or data. It has the ability to store, retrieve, and process data to perform a wide variety of tasks—from writing documents and sending emails to running complex web applications, executing code, and managing databases.

The Core Functions: The IPOS Cycle

To understand what a computer does at a fundamental level, we look at the four basic operations it performs sequentially, known as the IPOS Cycle:

• Input: This is how you get data and instructions into the computer. You use input devices like a keyboard, mouse, touchscreen, microphone, or scanner.
• Processing: This is the execution phase. The Central Processing Unit (CPU) takes the raw input data, manipulates it according to specific instructions (software), and performs mathematical or logical calculations.
• Storage: A computer requires locations to keep data. This includes temporary storage (RAM) for files actively being processed, and permanent storage (SSD or Hard Drive) to keep data secure even when the system is turned off.
• Output: This is the resulting processed information returned to the user. Output devices include monitors, screens, speakers, or printers.

The Two Pillars: Hardware and Software

A computer cannot operate without the constant collaboration of physical machinery and digital instructions.