The term "horizontal" refers to a direction or orientation that is parallel to the horizon. It is often used to describe lines, surfaces, or objects that are level and do not incline upward or downward. For example, a table has a horizontal surface that allows items to be placed on it without rolling off. In geometry, a horizontal line is one that runs from left to right, maintaining a constant height. This concept is important in various fields, including architecture, where horizontal elements can create a sense of stability and balance in a design.