Network activity of Ethereum had increased so much, the fees are skyrocketed, and reached new highs. The transaction fees almost doubled in the past days. The average fee became bigger than in the summer, at the peak of defi-craziness. Now the trading activity grew, this is the reason for the expensive costs. The new record-high average fee was 17.4 USD, which is significantly bigger than the previously 12.5 USD highs.
Ethereum, as a world-computer, works as an operating system where you can deploy and run applications, protocols. Similar when you download an app to your phone. But Ethereum dapps are decentralized, without custody, or central party, so every action counted as an on-chain transaction, with a price-tag.