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Placeholder: In systems like decimal (base-10), it shows the absence of a value in a specific place, e.g., the '0' in 205 means no tens.

Additive Identity: Adding or subtracting 0 from any number leaves it unchanged (e.g., 5 + 0 = 5).

Neutral Number: It's neither positive nor negative, sitting at the center of the number line (..., -1, 0, 1, ...).

Multiplication: Any number multiplied by zero always results in zero (e.g., 7 x 0 = 0).

Division: Division by zero is undefined in arithmetic.

Usage: Foundational in math, science, computing, and used in various contexts like scores (love in tennis, duck in cricket) or slang (zilch, nada).