Printed flexible sensors, PFS, are revolutionizing the world of electronics by combining the advantages of flexible materials and printing technologies. PFS are devices created using printing techniques to deposit sensor materials (e.g., functional inks) on flexible substrates such as plastics, fabrics, or paper. PFS detect physical, chemical, or biological signals and convert them into electrical signals for data analysis. Unlike traditional rigid sensors, these sensors can bend, twist, and stretch, offering a unique solution in applications requiring adaptability to non-flat surfaces or dynamic environments. These sensors are lightweight, conformable, and can be produced cost-effectively, making them ideal for a wide range of applications, from wearable devices and healthcare monitoring to environmental sensing and smart packaging.