Write a critical note on REFORMATION?ANSWER IN DETAIL
You'll have to do some research on your own to find critical discussions on the Reformation, as it's such a broad subject. And to get any sense of detail, you really need to do that reading; however, I can give you a brief overview of the period and the movement.
The Catholic Church was the only option for religious practice in England up until the Reformation. The Church was more of a social institution, subject to all the corruption, greed, and sin which one might expect to find in places other than the Church. Martin Luther, as a young monk, was appalled at the state of the Church at the highest level, He visited Rome expecting to find the holiness which he was seeking; what he found was a Church that was literally "selling" forgiveness, figuratively selling salvation, and constantly grasping for money in order to create edifices and to support lavish lifestyles for these supposed men of God.
A disillusioned Luther led a movement to reform the Church, nailing his "95 Theses" to the Church door in 1517. This was in invitation to the Church to debate the current practices of the Church from the Word of God. This birthed what is now called the Reformation, from which we get many things we still have today: the Protestant (non-Catholic and born out of "protest") Church, the Lutheran denomination, and the Church of England.
This period runs concurrently with the English Renaissance and the Elizabethan Period. This battle between Catholics and Protestants rages in bloody fashion primarily during the reign of the Tudors, starting with Henry VIII, achieving some sense of peace by the end of Elizabeth's reign in 1604.
Hope that gets you started, anyway.