Touchscreens: The journey from Concept to Ubiquity Important for Prelims: Touchscreens, Smartphones, Human-Machine Interface, I/O Devices, ATM machines, various home appliances (including TVs and refrigerators), e-readers, Billing systems, Smartwatches, Sensors, PDAs and Electronic Voting Machines. Important for Mains: GS-3 (Science & Tech.): Touchscreens, type of touchscreens &...

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