What does the phrase full faith and credit mean in article IV of the constitution?

Full Faith and Credit

Article IV, section 1, of the Constitution provides that "Full Faith and Credit shall be given in each State to the public Acts, Records and judicial Proceedings of every other State; And the Congress may by general Laws prescribe the Manner in which such Acts, Records and Proceedings shall be proved, and the Effect thereof." This provision was designed to unify the nation by binding together its several states.