The integration of Industry 4.0 technologies, including automation, artificial intelligence (AI), and the Internet of Things (IoT), has significantly transformed the industrial sector. Central to this transformation are sensors and smart sensors, which have advanced to generate large volumes of data and enable new systems for quality assurance and predictive maintenance. Despite challenges related to data security, privacy, and ethical concerns, sensors play a crucial role in IoT and Industrial IoT (IIoT) systems, aiding in applications like asset monitoring and predictive maintenance. Furthermore, sensors in digital metrology have enhanced the precision of geometrical measurements, improving the communication and processing of measurement data. While Industry 4.0 technologies offer increased productivity, efficiency, and quality control, addressing standardization, cybersecurity, infrastructure, and training costs is essential for realizing the full potential of digital metrology and sensor systems.