Doctrine refers to a set of beliefs or principles that are officially held and taught by a group, organization, or institution. It often serves as a guiding framework for decision-making and behavior. In religious contexts, such as Christianity or Islam, doctrine outlines the core tenets of faith and practice that followers are expected to adhere to. In addition to religion, doctrine can also apply to areas like law and military strategy. In law, it refers to established legal principles that guide judicial decisions. In military contexts, doctrine encompasses the strategies and tactics that govern how forces operate in various situations.