A continent (from the Latin "continere" for "to hold together") is a large continuous mass of land.
There is no single standard for what defines a continent, and therefore various cultures and sciences have different lists of what are considered to be continents. In general, a continent must be large in area, consist of non-submerged land, and have geologically significant borders. While some consider that there are as few as four or five continents, the most commonly used counts are six or seven.
Two of the largest disagreements in listing continents are whether Europe and Asia should be considered separately or combined into Eurasia, and whether North America and South America should be considered separately or combined into America. A few geographers have also suggested grouping Europe, Asia, and Africa into a continent of Eurafrasia (see Africa-Eurasia).
The seven continent model is commonly taught in Western Europe and North America, while the six continent (combined Eurasia) model is also taught in North America and is the primary continent model used in scientific contexts. The six continent (combined America) model is commonly taught in Eastern Europe and South America.
Islands are usually considered to "belong" to the continent they are closest to, and hence the British Isles are considered to be a part of Europe. Sometimes "Australasia" or "Oceania" is used to refer collectively to Australia and the Pacific islands.
When "The Continent" is referred to without clarification by a speaker of the English language, it is usually presumed to mean Europe. Similarly, when the term "the Subcontinent" is used, it is presumed to refer to India.
See also Satellite Images of Continents