What is a Computer?

The Inside of a computer

What is a Computer?

A computer is device that computes, especially a programmable electronic machine that performs high-speed mathematical or logical operations or that assembles, stores, correlates, or otherwise processes information. It has input, output, storage and process.

Information from http://www.thefreedictionary.com/computer

Fundamentals of Computer Systems: What is a Computer?

Computer Input

Whatever goes into the computer. Input can take a variety of forms, from commands you enter from the keyboard to data from another computer or device. A device that feeds data into a computer, such as a keyboard or mouse, is called an input devices.

Input Devices Presentation
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Computer Output

A output is any information that has been processed by and sent out from a computer or similar device is considered output. A simple example of output is anything you view on your computer monitor. The bottom half of the image shows data being sent from the computer to a printer. That data is then printed onto a piece of paper; both are forms of output.

Computer Hardware : Output Devices (02:06)
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Computer Storage

Computer data storage, often called storage or memory, is a technology consisting of computer components and recording media used to retain digital data. It is a core function and fundamental component of computers.The central process unit(CPU) of a computer is what manipulates data by performing computations. In practice, almost all computers use a storage hierarchy, which puts fast but expensive and small storage options close to the CPU and slower but larger and cheaper options farther away. Often the fast volatile technologies (which lose data when powered off) are referred to as "memory", while slower persistent technologies are referred to as "storage"; however, "memory" is sometimes also used when referring to persistent storage.In the Von Neumann architecture, the CPU consists of two main parts: control unit and arithmetic logic unit (ALU). The former controls the flow of data between the CPU and memory, while the latter performs arithmetic and logical operations on data.

What is storage?
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Processor in computer

The central processing unit (CPU) of a computer is a piece of hardware that carries out the instructions of a computer program. It performs the basic arithmetical, logical, and input/output operations of a computer system. The CPU is like the brains of the computer - every instruction, no matter how simple, has to go through the CPU. So let's say you press the letter 'k' on your keyboard and it appears on the screen - the CPU of your computer is what makes this possible. The CPU is sometimes also referred to as the central processor unit, or processor for short. So when you are looking at the specifications of a computer at your local electronics store, it typically refers to the CPU as the processor.
How a CPU Works
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Conclusion

I think that people who invented the computer is really smart. They made the technology clever nowadays.:)