Sensors, often regarded as the "five senses" of the electromechanical world, collect various environmental parameters and convert them into machine-readable data. Smart sensors, with real-time processing and communication capabilities, improve system efficiency and performance while providing greater flexibility, reliability, and safety. These advantages make them essential in high-demand industries such as Industry 4.0 and autonomous vehicles. This report examines the development of the smart sensor industry from multiple angles, including global applications, leading brands, and product trends, while also exploring market opportunities within the smart sensor sector.