The increasing frequency and severity of extreme disaster events have exposed the limitations of traditional reliability-based approaches in ensuring the stable operation of integrated energy systems (IESs). This chapter provides a systematic overview of IES resilience from conceptual, comparative, and technological perspectives. First, the fundamental attributes and multi-stage evolution of IES resilience are introduced. Next, the similarities and differences between IES resilience and conventional power system resilience are analyzed, revealing the complementary roles of multi-energy coupling and cross-domain coordination in mitigating cascading failures. Finally, the chapter elaborates on key technologies for enhancing IES resilience.