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Determining the "most useful" product of technology can be subjective as it depends on individual needs and contexts.

However, several technological advancements have had a profound impact on society, enhancing various aspects of life and work.

Here are a few highly regarded technological innovations known for their widespread usefulness:  Internet: Often considered one of the most impactful inventions, the internet has revolutionized communication, access to information, commerce, education, and entertainment globally.

It enables connectivity, collaboration, and access to a vast array of resources. 

Smartphones: Combining various technologies such as computing, communication, cameras, and sensors into a handheld device, smartphones have become essential tools for communication, productivity, navigation, entertainment, and accessing information on the go.

 Personal Computers: PCs have transformed the way we work, learn, and communicate. They enable tasks ranging from basic word processing to complex data analysis and programming, impacting various industries and facilitating innovation. 

Electricity: While not a recent invention, electricity remains one of the most fundamental technological innovations that power countless devices and infrastructures, enabling modern living, manufacturing, and technological advancements. 

Medical Imaging Technology: Innovations in medical imaging, such as MRI (Magnetic Resonance Imaging), CT (Computed Tomography), and X-rays, have revolutionized healthcare by allowing non-invasive visualization of the human body, aiding in diagnosis and treatment planning.  

GPS (Global Positioning System): GPS technology has transformed navigation and location-based services, facilitating precise mapping, transportation, logistics, emergency services, and everyday navigation through smartphones and devices. 

Cloud Computing: Offering scalable and accessible storage and computing power over the internet, cloud computing has revolutionized data storage, collaboration, software development, and business operations. 

Artificial Intelligence (AI): AI technologies have applications in various fields, including healthcare, finance, autonomous vehicles, natural language processing, and more, optimizing processes and decision-making. 

Determining the "most useful" product often depends on its impact on improving efficiency, solving problems, and enhancing the quality of life for individuals and society as a whole.

The usefulness of technology continues to evolve with ongoing innovations and their adoption in various domains.