Static Knowledge Graphs assume facts remain immutable. In reality, a statement like (Person: "Satya Nadella")-[:IS_CEO_OF]->(Company: "Microsoft") is valid only after February 4, 2014. Temporal Knowledge Graphs augment standard 3-tuples into 5-tuples: (Subject, Predicate, Object, ValidFrom, ValidTo), allowing AI systems to travel back in time for compliance audits.