All-terrain is a phrase commonly used to describe vehicles or equipment that can function on any type of terrain including rough surfaces, mud, rocks, snow, and sand. Some synonyms for all-terrain include off-road, rough terrain, cross-country, and four-wheel drive. These words are often used interchangeably with all-terrain to describe the ability of a vehicle or equipment to perform in diverse outdoor environments. Other adjectives used to describe all-terrain objects include versatile, robust, rugged, and durable. A range of machines such as dirt bikes, jeeps, and construction equipment can be considered all-terrain, and they require specific features and capabilities to be successful in challenging environments.