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Ireland (in Irish, Éire) is the political entity consisting of the island of Ireland excepting Northern Ireland, 1937-present.  This is the name of the state according to the Irish Constitution.

The Republic of Ireland  a legal "description" of Ireland excepting Northern Ireland, 1949-present. This form is used where tact or disambiguity demands.  It is also the name used by the international football team.

Northern Ireland 1922-present.  That part of the island of Ireland north of the line of partition of 1922, and which is still part of the United Kingdom. It is sometimes referred to as "the North of Ireland", "the six counties" or the "occupied six counties," especially by Irish Nationalists.

Ulster The name of one of Ireland's four traditional provinces. It contains nine counties, six of which make up Northern Ireland, three of which are part of the Republic of Ireland. It is now primarily used in sporting and cultural contexts by both communities. However, the six counties which form Northern Ireland are sometimes also referred 'Ulster'. See Ulster (disambiguation).