Smart Wide Area Monitoring (SWAM) is a critical technology for overseeing and controlling large-scale systems such as transportation networks and power grids in real time. This chapter explores the foundations, applications, and future trends of SWAM, highlighting its significance in ensuring system integrity, reliability, and efficiency. SWAM utilizes advanced technologies like the Internet of Things (IoT), sophisticated sensors, big data analytics, and artificial intelligence (AI) to gather, analyse, and interpret data from vast geographic regions. The chapter delves into system operations monitoring, IoT-specific integration in SWAM, and smart grid application and also looks into real-world case studies that emphasize the importance of SWAM.