What is Resolution of Monitor? Full HD vs 2K vs 4K

As you may know, many displays or monitors nowadays boast about having 4K UHD (Ultra HD); however, what exactly is 4K UHD, and how is it different from the Full HD we were used to seeing in the past?

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2K resolution - Wikipedia

What resolutions are there between FHD (1080p),2k, and 4k? - Quora

2K vs. 4K: What's the Difference Between These Display Resolutions? - History-Computer

2K vs. 4K: What's the Difference Between These Display Resolutions? - History-Computer

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From 4K to UHD to 1080p: What You Should Know About TV Resolutions - CNET

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What is 4K? What is Ultra HD?