There has been a change in the underlying technology of ether.
The successful transition from a proof-of-work to a proof-of-stake consensus mechanism means that the platform no longer has the large energy footprint that comes with it.
The way for other important improvements and optimizations in the future has been paved by the fact that Ethereum got a lot green. This is where you can get a detailed explanation of what The Merge means forcryptocurrencies.
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Vitalik Buterin said the transition was a big moment for the platform.
Regular users have not seen a change. Transactions are going through as usual despite the fact that there are still new blocks being produced. I've done a test transaction where I sent a small amount of ether from one address to another and the cost was about the same as before.
Several delays have pushed the transition into the future compared to what was originally planned, and Buterin laid out a plan for transitioning to proof-of-stake as early as 2015. It was a major technical challenge and the first upgrade planned for the future of ether.
The price of ether, the underlying currency, has gone up. At writing time, the price of ether is $1,630, a 1.3% increase from the previous day.