An encyclical is a formal letter issued by the Pope to address important issues within the Catholic Church and society. These documents often provide guidance on moral, social, and theological matters, reflecting the Church's teachings and beliefs. Encyclicals are typically written in a clear and accessible style to reach a wide audience. Encyclicals can influence both Church doctrine and public opinion, as they often address contemporary challenges. They are part of the Church's tradition of teaching and can be referenced by clergy and laypeople alike. Notable examples include Rerum Novarum, which discusses social justice, and Laudato Si', which focuses on environmental issues.