The X-Intercept is the point where a graph crosses the horizontal axis, known as the X-axis. At this point, the value of Y is always zero. To find the X-intercept of a function, you set the equation equal to zero and solve for X. For example, in the linear equation Y = 2X + 4, the X-intercept can be found by setting Y to zero, resulting in 0 = 2X + 4. Solving this gives X = -2. The X-intercept is important in various fields, including mathematics and economics, as it helps analyze trends and behaviors in data.