5G is a big selling point of the iPhone 12s however what is it, and and how does it compare to 4G?

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The Backstory
5G service was recently introduced however its not meant to be a replacement for 4G but instead it works alongside it. 4G was introduced in 2012 and at the time was a mind blowing leap forward in technology. 5G increases the reliability of the 4G network whilst also increasing speeds and reducing latency.
What does 5G bring?
5G brings the potential of 1Gbps however most speeds are around 100Mbps, which is currently 10x faster than current 4G speeds. Latency is also reduced from around 35ms to just under 10ms.