The incorporation doctrine is a constitutional doctrine through which the first ten amendments of the United States Constitution (known as the Bill of Rights) are made applicable to the states through the Due Process clause of the Fourteenth Amendment. Incorporation applies both substantively and procedurally. Prior to the doctrine's (and the Fourteenth Amendment's) existence, the Bill of Rights applied only to the Federal Government and to federal court cases. States and state courts could choose to adopt similar laws, but were under no obligation to do so.
