what is horizontal

Horizontal means “side-to-side” rather than “up-and-down,” usually parallel to the ground or to the horizon you see where the earth and sky seem to meet.

Quick Scoop: What Is “Horizontal”?

Think of lying flat on your back in bed: your body is in a horizontal position, because it’s parallel to the ground. A horizontal line on a page runs from left to right and is not slanted up or down.

Simple Definitions

• In everyday language: flat or level, going across instead of up and down.

• In geometry: a line that runs left–right and is parallel to the horizon.

• For positions: someone lying flat is in a horizontal position.

• Opposite word: vertical (up-and-down).

Other Uses of “Horizontal”

Besides direction, “horizontal” can also describe relationships or structures:

• Business: a “horizontal structure” means people or teams are on roughly the same level, instead of a strict top-down hierarchy.

• Economics/business: “horizontal mergers” are deals between companies at a similar level in the supply chain (for example, two competing media companies combining).

• Medicine/biology: “horizontal transmission” means a disease or genetic material spreads between individuals by contact, not by inheritance from parent to child.

Quick Mental Picture

• Horizontal = horizon, lying flat, left ↔ right.
• Vertical = standing tall, up ↑ and down ↓.

TL;DR: Horizontal is anything flat, level, and running side-to-side, parallel to the ground or horizon, and it contrasts with vertical, which goes up and down.

Information gathered from public forums or data available on the internet and portrayed here.