Today (June 2) NY Times has an article about Pope Francis visit to Romania. Much of the article discussed the position of the churches in the country. The vast majority are Romanian Orthodox, but there is a significant Catholic minority. In the article, the Catholics are described as Greek Catholics, not Roman Catholics. What is the distinction if any between these terms in the case of Romanian Catholics, who are not Greek (mostly Hungarian ethnicity in Transylvania)?
They are churches in full communion with the Pope in Rome that use the Byzantine liturgical rite, as opposed to the Latin rites. Usually called Eastern Catholic or, as the poster above me said, Uniate churches. They're pretty small, less than 20 million all told, but have a unique history and structure.