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Digital computers are commonly classified into four types: Supercomputers, Mainframe computers, Minicomputers, and Microcomputers.

This classification is based on their speed, size, and performance capabilities.

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getche() reads a single character from the keyboard and displays (echoes) it immediately on the screen.

It's part of conio.h in C programming, often used for interactive input.

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Coaxial cables typically support data transmission speeds between 10 Mbps to 200 Mbps, used in cable TV and internet.

They are shielded and suitable for medium-speed data over longer distances than twisted-pair cables.

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In Scratch programming, an event is something like clicking a sprite or pressing a key, and the program responds to it by running certain code.

Events help make Scratch projects interactive and dynamic.

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PowerPoint multimedia presentations consist of slides, animations, and can include slide shadows for effects.

These elements combine to create dynamic and engaging presentations.

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In BASIC programming, CLS stands for "Clear Screen".

It is used to erase all output from the screen and start fresh.

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Freeware is software that is completely free to use without any cost, though it is usually copyrighted.

Unlike shareware, freeware doesn’t expire or require payment after trial.

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A primary key uniquely identifies each record (row) in a database table.

It ensures data integrity by preventing duplicate and null entries in the key column.

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A telephone line supports full-duplex transmission, meaning both parties can talk and listen simultaneously.

Unlike half-duplex (e.g., walkie-talkie).

Full-duplex allows two-way communication at the same time.

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