The Additive Identity is a fundamental concept in mathematics, particularly in the field of algebra. It refers to the number that, when added to any other number, does not change the value of that number. In most number systems, including integers, fractions, and real numbers, the additive identity is the number 0. For example, adding 0 to 5 results in 5, demonstrating that 0 is the additive identity. This property is essential for various mathematical operations and helps maintain consistency in calculations. The concept of the additive identity is also crucial in understanding more complex structures, such as vector spaces and groups, where it plays a role in defining the identity element for addition.