What are the epistles?

The term "epistles" refers to letters written in the New Testament of the Bible. These letters were written by apostles and leaders of the early Christian church to various Christian communities or individuals to provide guidance, teaching, and encouragement. The epistles address theological issues, ethical concerns, and practical matters related to Christian life and community. Some of the most well-known epistles in the New Testament include the letters of Paul, Peter, John, James, and Jude.