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The whole of Northern Ireland has a temperate maritime climate, rather wetter in the west than the east although cloud cover is persistent across the region. The weather is unpredictable at all times of the year, and although the seasons are distinct they are considerably less pronounced than in interior Europe or the eastern seaboard on North America. Average daytime maximums in Belfast are 6.5°C in January and 17.5°C in July. The damp climate and extensive deforestation in the 16th and 17th Centuries results in much of the region being covered in rich green grassland.

The state was neutral during World War II but offered some assistance to the Allies. In 1949 the state was declared to be a republic; since that time it has been commonly referred to as the "Republic of Ireland". The state was plagued by poverty and emigration until the 1990s. That decade saw the beginning of unprecedented economic success, in a phenomenon known as the "Celtic Tiger". By the early 2000s, it had become one of the richest countries (in terms of GDP per capita) in the European Union, moving from being a net recipient to a net contributor and from a population with net emigration to one with net immigration.

A majority of the present-day population are unionist and wish to remain part of the United Kingdom, but a significant minority, known as nationalists, want to see a united Ireland. These two views are linked to deeper cultural divisions. Unionists are predominantly Protestant and often descendants of Scottish and English (mainly Scottish) settlement in previous centuries, while nationalists are predominantly Catholic and usually descend from the Irish population predating such settlement. The conflict between these two sets of identities, including alleged discrimination against nationalists under the Stormont government (1920–72) giving rise to the nationalist "Civil Rights Movement" in the 1960s, and eventually to a long-running conflict known as The Troubles.

The Anglo-Irish Treaty was narrowly ratified by the Dáil in December 1921 but was rejected a large minority, resulting in the Irish Civil War which lasted until 1923. In 1922, in the middle of this war, the Irish Free State came into being. For its first years the new state was governed by the victors of the Civil War. However in the 1930s Fianna Fáil, the party of the opponents of the treaty, were elected into government. The party introduced a new constitution in 1937 which renamed the state to simply "Ireland".

The island is often referred to as being part of the British Isles. However, some people, especially in Ireland, take exception to this name, which seems to suggest that both islands belong to Britain. For this reason, "Britain and Ireland" is commonly used as a more neutral alternative. Another suggestion, although much less used, is the Islands of the North Atlantic (IONA).

Ulster Scots comprises varieties of the Scots language spoken in Northern Ireland. Many claim it has become a separate language, descended from Scots in Scotland, whereas others question whether Scots is a separate language from English at all, or simply a collection of local dialects of Scottish and Northern Ireland Hiberno-English.

The Republic of Ireland is a common law jurisdiction. The judiciary consists of the Supreme Court, the High Court and many lower courts established by law. Judges are appointed by the President after being nominated by the Government and can be removed from office only for misbehaviour or incapacity, and then only by resolution of both houses of the Oireachtas. The final court of appeal is the Supreme Court, which consists of the Chief Justice and seven other justices. The Supreme Court has the power of judicial review and may declare to be invalid both laws and acts of the state which are repugnant to the constitution.