What is used to input text and numerical data in a computer?

Question

Accepted Answer

The correct option is (1):
The Keyboard is the fundamental and primary input device utilized for entering alphanumeric data, which includes text (letters and symbols) and numerical data, directly into a computer system. Its design, inherited from the traditional typewriter, allows a user to press keys, which in turn generate electronic signals that are instantly interpreted by the computer's operating system and application software as characters. This mechanism is essential for tasks like writing documents, composing emails, typing commands, and entering figures into spreadsheets. While other input devices exist, the keyboard remains the most efficient and indispensable tool for the bulk, character-by-character input of textual and numerical information.

The incorrect option is (2):
A Scanner is an input device, but its function is to capture physical, hard-copy documents or images and convert them into a digital format, essentially creating a picture file. It is a specialized device for digitizing external content, not for direct, real-time text creation or numerical data entry by the user. While some scanners integrate Optical Character Recognition (OCR) software to *extract* editable text from the image, the core hardware itself is an image-capturing tool. Therefore, it is not the standard interface for typing or manually inputting data.

The incorrect option is (3):
A Printer is classified as an **output device**. Its role is to take electronic data—such as text documents, spreadsheets, or images—from the computer's memory and generate a physical copy on paper. This process is the reverse of input; it makes data visible and tangible outside the computer. Consequently, it cannot be used to transmit or input text or numerical data *into* the computer for processing.

The incorrect option is (4):
A Plotter is also an **output device**, specifically designed for printing high-quality vector graphics, technical diagrams, and large-scale blueprints. It operates by drawing continuous lines using a pen or other tool, making it highly accurate for engineering and architectural drawings. Like a printer, its sole purpose is to convert digital design data into a physical format. It does not possess the capacity to receive or input text and numerical data into the computer system.