why can’t computers have thousands of cores?

If you're watching this video on any device made in the last 10 years, be it a desktop, a laptop, a tablet or a phone, then there is an extremely high chance that your device is powered by a multi-core processor. Since the release of the first dual core processor in 2005 by IBM, it has become more and more common for computer processors of all varieties to be multi-core. This is in direct contrast to laptops in the 2000's, like my iBook G4 for example, which was powered by a single core PowerPC processor at around 800MHz. Now a days, it is common for any desktop to have at least 4 cores, and clocked easily into the GHz.
But what does it mean for a processor to have multiple cores? How does a processor with multiple cores work? Why are more cores better than just one? How many cores are too many? These are all really important questions, and, like you, I was curious to find the answer.
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