Is Horizontal Straight

A horizontal line is a straight line that is drawn from left to right or right to left and it is parallel to the x-axis

Is horizontal straight or down?

A vertical line is one the goes straight up and down. The horizontal line is a straight line that goes from left to right.

What is the difference between horizontal and straight line?

As adjectives the difference between horizontal and straight is that horizontal is perpendicular to the vertical; parallel to the plane of the horizon; level, flat while straight is not crooked or bent; having a constant direction throughout its length.