The names Ireland and Éire derive from Old Irish Eriu. This in turn comes from the Proto-Celtic *Iveriu (compare Welsh Iwerddon), which is also the source of Latin Hibernia. Iveriu derives from a root meaning 'fat, prosperous.

During the last glacial period, and until about 10,000 BC, most of Ireland was periodically covered in ice. Sea levels were lower and Ireland, like Great Britain, formed part of continental Europe. By 16,000 BC, rising sea levels due to ice melting caused Ireland to become separated from Great Britain. Later, around 6000 BC, Great Britain itself became separated from continental Europe. The earliest evidence of human presence in Ireland is dated at 10,500 BC, demonstrated by a butchered bear bone found in a cave in County Clare.[12] It is not until about 8000 BC, however, that more sustained occupation of the island has been shown, with evidence for Mesolithic communities around the island. These Mesolithic communities lived as hunter-gatherers across the island until about 4000 BC.

There are three World Heritage Sites on the island: the Brú na Bóinne, Skellig Michael and the Giant's Causeway. A number of other places are on the tentative list, for example the Burren, the Ceide Fields and Mount Stewart.

Some of the most visited sites in Ireland include Bunratty Castle, the Rock of Cashel, the Cliffs of Moher, Holy Cross Abbey and Blarney Castle. Historically important monastic sites include Glendalough and Clonmacnoise, which are maintained as national monuments in the Republic of Ireland.

Dublin is the most heavily touristed region and home to several of the most popular attractions such as the Guinness Storehouse and Book of Kells. The west and south west, which includes the Lakes of Killarney and the Dingle peninsula in County Kerry and Connemara and the Aran Islands in County Galway, are also popular tourist destinations.

Achill Island lies off the coast of County Mayo and is Ireland's largest island. It is a popular tourist destination for surfing and contains 5 Blue Flag beaches and Croaghaun one of the worlds highest sea cliffs. Stately homes, built during the 17th, 18th and 19th centuries in Palladian, Neoclassical and neo-Gothic styles, such as, Castle Ward, Castletown House, Bantry House, Glenveagh Castle are also of interest to tourists. Some have been converted into hotels, such as Ashford Castle, Castle Leslie and Dromoland Castle.

Ireland's culture comprises elements of the culture of ancient peoples, later immigrant and broadcast cultural influences (chiefly Gaelic culture, Anglicisation, Americanisation and aspects of broader European culture). In broad terms, Ireland is regarded as one of the Celtic nations of Europe, alongside Scotland, Wales, Cornwall, Isle of Man and Brittany. This combination of cultural influences is visible in the intricate designs termed Irish interlace or Celtic knotwork. These can be seen in the ornamentation of medieval religious and secular works. The style is still popular today in jewellery and graphic art, as is the distinctive style of traditional Irish music and dance, and has become indicative of modern "Celtic" culture in general.

Religion has played a significant role in the cultural life of the island since ancient times (and since the 17th century plantations, has been the focus of political identity and divisions on the island). Ireland's pre-Christian heritage fused with the Celtic Church following the missions of Saint Patrick in the 5th century. The Hiberno-Scottish missions, begun by the Irish monk Saint Columba, spread the Irish vision of Christianity to pagan England and the Frankish Empire. These missions brought written language to an illiterate population of Europe during the Dark Ages that followed the fall of Rome, earning Ireland the sobriquet, "the island of saints and scholars".

Since the 20th century the Irish pubs worldwide have become, especially those with a full range of cultural and gastronomic offerings, outposts of Irish culture