The Z-axis is one of the three orthogonal axes in a three-dimensional Cartesian coordinate system. It is perpendicular to both the X-axis and the Y-axis, and extends in a direction that is commonly referred to as the "depth" or "height" axis. In a right-handed coordinate system, the Z-axis typically points upwards towards the positive direction, while in a left-handed coordinate system, it points downwards towards the negative direction.The Z-axis is commonly used to represent the third dimension in 3D graphics, computer modeling, and virtual reality applications. It is often used to represent the depth or elevation of objects or points in a 3D scene. For example, in a 3D video game, the Z-axis can be used to determine the position of objects in the game world along the depth or height axis, allowing for objects to be placed in front of or behind other objects, creating a sense of depth and perspective. Similarly, in computer-aided design (CAD) or architectural modeling, the Z-axis can be used to represent the elevation or height of objects or structures in a 3D model, allowing for accurate representation of the vertical dimension.