It refers to a wide variety of Christian churches - many of the non-catholic churches are included in this category. From the Wikipedia article: "The term is most closely tied to those groups that separated from the Roman Catholic Church in the sixteenth-century Protestant Reformation."
This is a very broad question. There are literally thousands of protestant denominations.
Basically, protestant denominations rooted from Catholicism. They have different beliefs on The Bible which varies every denomination. Protestant churches are Christian but not Catholic or Orthodox.
Protestant churches are Christian.
Protestantism is a form of Christianity. The term Protestant came from European societies 'protesting' the rule and the power of the Catholic Church and its leader the Pope. Protestants follow the old and the new testaments of the Christian Bible. There are many denominations of Protestantism, such as Anglican, Baptist, Congregational, Lutheran, Methodist, Pentecostal, Quaker, or Reformed; and each of these denominations include a number of different sects of their own.
Protestantism is a form of Christianity. Protestants reject certain aspects of other Christian faiths (such as Roman Catholicism and Orthodoxy) that they consider to be extra-biblical.
Protestants are catholic Christians, for the most part.
. . . catholic with a lower case "c" means all-inclusive, but does not mean, "Roman Catholic."
Protestantism.
Protestantism
catholicism and protestantism
Christian.
Protestantism in Ireland.
Christianity; protestantism.
protestantism
Christianity; protestantism.
Sir Francis Walsingham's religion was Protestantism.
England major practiced religion is Protestantism.
The Church of Finland (Lutheran protestantism) is the official religion.
Christianity.