Negative three is a number that is less than zero. It is represented as -3 on the number line, which indicates its position to the left of zero. Negative numbers, including negative three, are used in various mathematical contexts, such as representing debt or temperatures below freezing. In everyday life, negative three can be used to describe situations like a temperature of -3 degrees Celsius, which is below the freezing point of water. It can also represent a loss of three units in a game or a financial context, where it indicates a deficit.