Yes, Ethereum coins are limited. There will only ever be a total of 18 million ETH in existence. This number is set in stone and cannot be changed. While this may seem like a small amount, it is actually quite large when compared to other cryptocurrencies. For example, Bitcoin has a total supply of 21 million BTC. Thus, Ethereum has a slightly smaller supply than Bitcoin. However, Ethereum's smaller supply could potentially make it more valuable in the long run. While the total supply of ETH is fixed, the number of ETH coins in circulation is constantly changing. This is because Ethereum is constantly being bought and sold on exchanges. When someone buys ETH, they are effectively taking it out of circulation. Conversely, when someone sells ETH, they are putting it back into circulation. The total supply of ETH will remain at 18 million, but the number of ETH coins in circulation will fluctuate depending on demand. It's also worth noting that not all of the 18 million ETH will be mined immediately. Ethereum's mining process is designed to release new ETH gradually over time. This is done to ensure that the Ethereum network remains stable and secure. Thus, it will take several years for all 18 million ETH to be mined. In conclusion, yes, Ethereum coins are limited. There will only ever be a total of 18 million ETH in existence. However, the number of ETH coins in circulation will fluctuate depending on demand.