This article provides a comprehensive overview of wireless charging technologies, their technical standards, and network applications. Wireless charging, also known as wireless power transfer, has gained significant attention due to its convenience and user-friendliness compared to traditional wired charging. The technology is being widely adopted in portable devices, from low-power toothbrushes to high-power electric vehicles. The article covers the fundamental principles of wireless charging, including inductive coupling, magnetic resonance coupling, and RF/microwave radiation. It discusses the development history, technical breakthroughs, and commercialization of wireless charging, highlighting the evolution from theoretical foundations to practical applications. The article also reviews the existing international standards, such as Qi and A4WP, and their implementations in commercial products. It delves into the hardware design and implementation of wireless charging systems, including the architecture, coil design, and power transfer efficiency. The performance of different wireless charging techniques is compared, and the impact of factors like mutual inductance, quality factor, and load matching on power transfer efficiency is analyzed. Additionally, the article explores the network applications of wireless charging, focusing on static charger scheduling strategies, mobile charger dispatch strategies, and wireless charger deployment strategies. It discusses the challenges and open issues in implementing wireless charging technologies and envisions future network applications. The article concludes by summarizing the key findings and future research directions in the field of wireless charging.This article provides a comprehensive overview of wireless charging technologies, their technical standards, and network applications. Wireless charging, also known as wireless power transfer, has gained significant attention due to its convenience and user-friendliness compared to traditional wired charging. The technology is being widely adopted in portable devices, from low-power toothbrushes to high-power electric vehicles. The article covers the fundamental principles of wireless charging, including inductive coupling, magnetic resonance coupling, and RF/microwave radiation. It discusses the development history, technical breakthroughs, and commercialization of wireless charging, highlighting the evolution from theoretical foundations to practical applications. The article also reviews the existing international standards, such as Qi and A4WP, and their implementations in commercial products. It delves into the hardware design and implementation of wireless charging systems, including the architecture, coil design, and power transfer efficiency. The performance of different wireless charging techniques is compared, and the impact of factors like mutual inductance, quality factor, and load matching on power transfer efficiency is analyzed. Additionally, the article explores the network applications of wireless charging, focusing on static charger scheduling strategies, mobile charger dispatch strategies, and wireless charger deployment strategies. It discusses the challenges and open issues in implementing wireless charging technologies and envisions future network applications. The article concludes by summarizing the key findings and future research directions in the field of wireless charging.