In the era of high urbanization, there is a rapid shift in people's demands and needs for housing and accommodations. These demands require city planners to create technology-friendly and future-looking designs for the world's growing population. The concept of the smart city combines the principle of sustainability with optimal utilization of resources to help reduce overconsumption of resources, ensuring these necessities for future generations. However, this concept has bombarded the market with an exponentially growing number of applications and technologies across many sectors affecting our daily lives, such as surveillance, HVAC, security, and emergency response. Digital Cities uses real-world cases studies and expert insights to comprehensively explore the innovative technologies changing the landscape of smart city planning.