Zero

Zero is a number that represents the absence of quantity or nothingness. It serves as a fundamental concept in mathematics, acting as a starting point for counting and a placeholder in our number system. Zero allows us to differentiate between numbers like 10 and 100, indicating the absence of units in a particular place. It also plays a critical role in operations such as addition, subtraction, and defining concepts like zero degrees in temperature or zero in scientific notation. Overall, zero is essential for understanding quantities and performing calculations accurately.