GAELIC
Scottish Gaelic is basically just an older, more conservative form of Irish Gaelic.

The Scots or Scotti were originally a Celtic tribe living in northern Ireland. Between the 6th and 10th centuries A.D., some of them migrated to northern Britain then called Caledonia, now called Scotland. They took their north Irish Gaelic dialect along with them and it later evolved into Scots Gaelic.

The Irish Gaelic is different from the Scottish Gaelic. Its a little bit like the difference between Spanish and Portuguese.