Irish is an Indo-European language from the Celtic group of languages. It is one of the national languages of the Republic of Ireland, the other being English. Irish has a similar grammatical structure to Latin or German. As a language, it is more closely related to Scottish Gaelic and Manx. In fact, there are actually a lot of similarities between these three languages with deviances in pronunciations and spellings.
It has three main dialects, Munster, Connacht, and Ulster. The more standard version of the language is a combination of the three dialects. It is taught in public schools and used in the civil service.