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Referring to "3G" and "4G," these terms are related to mobile communication technologies.

1. 3G (Third Generation): This was the third generation of mobile telecommunications technology. It brought faster data transfer speeds compared to its predecessor, 2G. With 3G, mobile users could access the internet more efficiently, make video calls, and use other data-intensive services.
2. 4G (Fourth Generation): 4G is the fourth generation of mobile telecommunications technology, succeeding 3G. It offers even faster data transfer speeds, improved voice quality, and better support for mobile internet and various multimedia applications. It's the technology that enabled widespread use of services like video streaming and high-speed internet on mobile devices.