Ireland is an island in the North Atlantic. It is separated from Great Britain to its east by the North Channel, the Irish Sea, and St George's Channel. Ireland is the second-largest island of the British Isles, the third-largest in Europe, and the twentieth-largest on Earth.

Geopolitically, Ireland is divided between the Republic of Ireland (officially named Ireland), which covers five-sixths of the island, and Northern Ireland, which is part of the United Kingdom. In 2011, the population of Ireland was about 6.6 million, ranking it the second-most populous island in Europe after Great Britain. As of 2016, 4.8 million live in the Republic of Ireland, and 1.8 million live in Northern Ireland.

The geography of Ireland comprises relatively low-lying mountains surrounding a central plain, with several navigable rivers extending inland. Its lush vegetation is a product of its mild but changeable climate which is free of extremes in temperature. Much of Ireland was woodland until the end of the Middle Ages. Today, woodland makes up about 10% of the island, compared with a European average of over 33%, and most of it is non-native conifer plantations. There are twenty-six extant land mammal species native to Ireland. The Irish climate is influenced by the Atlantic Ocean and thus very moderate, and winters are milder than expected for such a northerly area, although summers are cooler than those in continental Europe. Rainfall and cloud cover are abundant.

Irish culture has had a significant influence on other cultures, especially in the field of literature. Alongside mainstream Western culture, a strong indigenous culture exists, as expressed through Gaelic games, Irish music and the Irish language. The island's culture shares many features with that of Great Britain, including the English language, and sports such as association football, rugby, horse racing, and golf.

The island is divided between the Republic of Ireland, an independent state, and Northern Ireland (a constituent country of the United Kingdom). They share an open border and both are part of the Common Travel Area.

The Republic of Ireland is a member of the European Union while the United Kingdom is a former member, having both acceded to its precursor entity, the European Economic Community [EEC], in 1973, and as a consequence there is free movement of people, goods, services and capital across the border.

The Republic of Ireland is a parliamentary democracy based on the British model, with a written constitution and a popularly elected president who has mostly ceremonial powers. The government is headed by a prime minister, who is appointed by the President on the nomination of the lower house of parliament, the Dáil. Members of the government are chosen from both the Dáil and the upper house of parliament, the Seanad. Its capital is Dublin.

The republic today ranks amongst the wealthiest countries in the world in terms of GDP per capita and in 2015 was ranked the sixth most developed nation in the world by the United Nations' Human Development Index. A period of rapid economic expansion from 1995 onwards became known as the Celtic Tiger period, was brought to an end in 2008 with an unprecedented financial crisis and an economic depression in 2009.

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