Calvinism is not a faith, it is a theology in salvation. Calvinism teaches that salvation is by grace through faith, other theologies teach that salvation is earned also through good works.
Protestants are pretty much any Christian denomination other than the Catholics. However some assume that they are mostly members of the Church of England, ie. the Anglicans.
Answer.
In general...
Protestants are Christians and there are many different denominations. Some of their beliefs are different from Catholics (most Protestants accept divorce and believe it is acceptable to use birth...