The X-axis is a horizontal line on a graph that represents the independent variable in a two-dimensional coordinate system. It is commonly used in mathematics and science to plot data points, showing how one variable affects another. The values along the X-axis can represent various types of data, such as time, distance, or categories. In a standard Cartesian coordinate system, the X-axis intersects with the Y-axis, which is the vertical line representing the dependent variable. Together, they create a grid that helps visualize relationships between variables, making it easier to analyze trends and patterns in data.