A خط (line) is a straight one-dimensional figure that extends infinitely in both directions. It is defined by two points, which are used to determine its position in space. In geometry, lines are fundamental elements that help in constructing shapes and understanding spatial relationships. In mathematics, lines can be represented using equations, such as the slope-intercept form, which describes the relationship between the x and y coordinates on a graph. Lines are also essential in various fields, including art, design, and engineering, where they help create structure and guide visual elements.