Transport includes movement of people and goods using vehicles, animals, or humans. Modes of transport include land, water, and air. Land transport includes roads, railways, and pipelines. Important global highways connect cities across continents, while rail networks vary in gauge between countries. Water transport via oceans and inland waterways is efficient for bulk cargo over long distances. Notable shipping routes circle the globe. Air transport is fastest but most expensive, with key intercontinental routes connecting major cities by air. Pipelines efficiently transport liquids and gases. Communications have advanced with satellites and internet now connecting the world digitally.